Custom ion-icon with SVG files made on Inkscape in Ionic 5 - ionic-framework

Question

I'm having troubles displaying a custom ion-icon with a custom SVG made on Inkscape. My icon is received by the site (I can see it in the network tab in the Firefox developer tools) but its div container is empty.
I'm trying to display the icon in an ion-item like that:
<ion-item button>
<ion-icon name="custom-logo" slot="start"></ion-icon>
<ion-label>Account</ion-label>
</ion-item>
I've configured the angular.json file, that's not the problem. I'm just applying this style-sheet rule to it:
ion-icon {
color: var(--ion-color-dark);
}
Here's the result of the HTML page I get on my browser (an empty div.icon-inner):
<ion-icon _ngcontent-dxl-c134="" name="custom-logo" slot="start" ng-reflect-name="custom-logo" role="img" class="md hydrated" aria-label="custom logo">
#shadow-root (open)
<style>…</style>
<div class="icon-inner"></div>
</ion-icon>
My custom SVG file looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<svg width="6.35mm" height="6.3489mm" version="1.1" viewBox="0 0 6.35 6.3489" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Custom Logo</title>
<defs>
<linearGradient id="linearGradient1106">
<stop stop-color="#fff" offset="0"/>
<stop stop-color="#646464" offset="1"/>
</linearGradient>
<linearGradient id="linearGradient1362-1" x1="63.286" x2="140.95" y1="540.13" y2="461.71" gradientTransform="translate(426.24 17.287)" gradientUnits="userSpaceOnUse">
<stop stop-color="#ff3e3b" offset="0"/>
<stop stop-color="#2120ff" offset="1"/>
</linearGradient>
<clipPath id="clipPath1328-8">
<circle cx="78.738" cy="583.32" r="40.831" fill="none" stroke-opacity="0"/>
</clipPath>
<linearGradient id="linearGradient1689" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(373.26 -207.84)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1691" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(393.67 -207.84)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1693" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(373.26 -187.43)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1695" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(393.67 -187.43)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1697" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(414.09 -207.84)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1699" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(414.09 -187.43)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1701" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(414.09 -228.25)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1703" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(393.67 -228.25)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1705" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(373.26 -228.25)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1707" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(434.5 -228.25)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1709" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(434.5 -207.84)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1711" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(434.5 -187.43)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1713" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(373.26 -167.02)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1715" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(393.67 -167.02)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1717" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(414.09 -167.02)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
<linearGradient id="linearGradient1719" x1="54.051" x2="74.461" y1="544.29" y2="564.7" gradientTransform="translate(434.5 -167.02)" gradientUnits="userSpaceOnUse" xlink:href="#linearGradient1106"/>
</defs>
<metadata>
<rdf:RDF>
<cc:Work rdf:about="">
<dc:format>image/svg+xml</dc:format>
<dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/>
<dc:title>Custom Logo</dc:title>
</cc:Work>
</rdf:RDF>
</metadata>
<g transform="translate(-497.12 -466.94)">
<g transform="matrix(.077312 0 0 .077312 458.69 430.84)">
<g transform="matrix(1.0048 0 0 1.0048 459.12 -78.133)" clip-path="url(#clipPath1328-8)" fill-rule="evenodd" stroke="#646464" stroke-width=".01">
<rect transform="rotate(45)" x="427.31" y="336.44" width="20.411" height="20.411" fill="url(#linearGradient1689)" opacity=".84828"/>
<rect transform="rotate(45)" x="447.73" y="336.44" width="20.411" height="20.411" fill="url(#linearGradient1691)" opacity=".84828"/>
<rect transform="rotate(45)" x="427.31" y="356.85" width="20.411" height="20.411" fill="url(#linearGradient1693)" opacity=".84828"/>
<rect transform="rotate(45)" x="447.73" y="356.85" width="20.411" height="20.411" fill="url(#linearGradient1695)" opacity=".84828"/>
<rect transform="rotate(45)" x="468.14" y="336.44" width="20.411" height="20.411" fill="url(#linearGradient1697)" opacity=".84828"/>
<rect transform="rotate(45)" x="468.14" y="356.85" width="20.411" height="20.411" fill="url(#linearGradient1699)" opacity=".84828"/>
<rect transform="rotate(45)" x="468.14" y="316.03" width="20.411" height="20.411" fill="url(#linearGradient1701)" opacity=".84828"/>
<rect transform="rotate(45)" x="447.73" y="316.03" width="20.411" height="20.411" fill="url(#linearGradient1703)" opacity=".84828"/>
<rect transform="rotate(45)" x="427.31" y="316.03" width="20.411" height="20.411" fill="url(#linearGradient1705)" opacity=".84828"/>
<rect transform="rotate(45)" x="488.55" y="316.03" width="20.411" height="20.411" fill="url(#linearGradient1707)" opacity=".84828"/>
<rect transform="rotate(45)" x="488.55" y="336.44" width="20.411" height="20.411" fill="url(#linearGradient1709)" opacity=".84828"/>
<rect transform="rotate(45)" x="488.55" y="356.85" width="20.411" height="20.411" fill="url(#linearGradient1711)" opacity=".84828"/>
<rect transform="rotate(45)" x="427.31" y="377.26" width="20.411" height="20.411" fill="url(#linearGradient1713)" opacity=".84828"/>
<rect transform="rotate(45)" x="447.73" y="377.26" width="20.411" height="20.411" fill="url(#linearGradient1715)" opacity=".84828"/>
<rect transform="rotate(45)" x="468.14" y="377.26" width="20.411" height="20.411" fill="url(#linearGradient1717)" opacity=".84828"/>
<rect transform="rotate(45)" x="488.55" y="377.26" width="20.411" height="20.411" fill="url(#linearGradient1719)" opacity=".84828"/>
</g>
<circle cx="538.18" cy="508" r="41.026" fill="url(#linearGradient1362-1)" opacity=".84828" stroke-opacity="0"/>
<g transform="translate(284.25 -120.42)" fill="none" stroke-linecap="round" stroke-linejoin="round" stroke-width="9.265">
<path d="m275.06 612.13c-6.2367 14.552-12.473 29.104-18.93 32.191-6.457 3.0868-13.134-5.2915-19.812-13.67" stroke="#212620" stroke-opacity=".39024"/>
<path d="m271.55 611.85c-6.2367 14.552-12.473 29.104-18.93 32.191-6.457 3.0868-13.134-5.2915-19.812-13.67" stroke="#fff"/>
</g>
</g>
</g>
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"+c+" invalid path type.")}if(0===t&&0===n||r>0){let e=window.getComputedStyle(o[r]).stopColor.match(/^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i),a=window.getComputedStyle(o[r]).stopOpacity,h=255;a&&(h=Math.floor(255*a)),e&&(0===i?(s[t][n]=[],s[t][n][0]=Math.floor(e[1]),s[t][n][1]=Math.floor(e[2]),s[t][n][2]=Math.floor(e[3]),s[t][n][3]=h):1===i?(s[t][n+1]=[],s[t][n+1][0]=Math.floor(e[1]),s[t][n+1][1]=Math.floor(e[2]),s[t][n+1][2]=Math.floor(e[3]),s[t][n+1][3]=h):2===i?(s[t+1][n+1]=[],s[t+1][n+1][0]=Math.floor(e[1]),s[t+1][n+1][1]=Math.floor(e[2]),s[t+1][n+1][2]=Math.floor(e[3]),s[t+1][n+1][3]=h):3===i&&(s[t+1][n]=[],s[t+1][n][0]=Math.floor(e[1]),s[t+1][n][1]=Math.floor(e[2]),s[t+1][n][2]=Math.floor(e[3]),s[t+1][n][3]=h))}}e[3*t+1][3*n+1]=new x,e[3*t+1][3*n+2]=new x,e[3*t+2][3*n+1]=new x,e[3*t+2][3*n+2]=new x,e[3*t+1][3*n+1].x=(-4*e[3*t][3*n].x+6*(e[3*t][3*n+1].x+e[3*t+1][3*n].x)+-2*(e[3*t][3*n+3].x+e[3*t+3][3*n].x)+3*(e[3*t+3][3*n+1].x+e[3*t+1][3*n+3].x)+-1*e[3*t+3][3*n+3].x)/9,e[3*t+1][3*n+2].x=(-4*e[3*t][3*n+3].x+6*(e[3*t][3*n+2].x+e[3*t+1][3*n+3].x)+-2*(e[3*t][3*n].x+e[3*t+3][3*n+3].x)+3*(e[3*t+3][3*n+2].x+e[3*t+1][3*n].x)+-1*e[3*t+3][3*n].x)/9,e[3*t+2][3*n+1].x=(-4*e[3*t+3][3*n].x+6*(e[3*t+3][3*n+1].x+e[3*t+2][3*n].x)+-2*(e[3*t+3][3*n+3].x+e[3*t][3*n].x)+3*(e[3*t][3*n+1].x+e[3*t+2][3*n+3].x)+-1*e[3*t][3*n+3].x)/9,e[3*t+2][3*n+2].x=(-4*e[3*t+3][3*n+3].x+6*(e[3*t+3][3*n+2].x+e[3*t+2][3*n+3].x)+-2*(e[3*t+3][3*n].x+e[3*t][3*n+3].x)+3*(e[3*t][3*n+2].x+e[3*t+2][3*n].x)+-1*e[3*t][3*n].x)/9,e[3*t+1][3*n+1].y=(-4*e[3*t][3*n].y+6*(e[3*t][3*n+1].y+e[3*t+1][3*n].y)+-2*(e[3*t][3*n+3].y+e[3*t+3][3*n].y)+3*(e[3*t+3][3*n+1].y+e[3*t+1][3*n+3].y)+-1*e[3*t+3][3*n+3].y)/9,e[3*t+1][3*n+2].y=(-4*e[3*t][3*n+3].y+6*(e[3*t][3*n+2].y+e[3*t+1][3*n+3].y)+-2*(e[3*t][3*n].y+e[3*t+3][3*n+3].y)+3*(e[3*t+3][3*n+2].y+e[3*t+1][3*n].y)+-1*e[3*t+3][3*n].y)/9,e[3*t+2][3*n+1].y=(-4*e[3*t+3][3*n].y+6*(e[3*t+3][3*n+1].y+e[3*t+2][3*n].y)+-2*(e[3*t+3][3*n+3].y+e[3*t][3*n].y)+3*(e[3*t][3*n+1].y+e[3*t+2][3*n+3].y)+-1*e[3*t][3*n+3].y)/9,e[3*t+2][3*n+2].y=(-4*e[3*t+3][3*n+3].y+6*(e[3*t+3][3*n+2].y+e[3*t+2][3*n+3].y)+-2*(e[3*t+3][3*n].y+e[3*t][3*n+3].y)+3*(e[3*t][3*n+2].y+e[3*t+2][3*n].y)+-1*e[3*t][3*n].y)/9}}this.nodes=e,this.colors=s}paintMesh(t,e){let 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</svg>
I've seen this post but it concerned Ionic 4, plus I've made the suggested solutions and it didn't work. I've exported the SVG in Inkscape as optimized SVG (but I tried other SVG format and it didn't work better). My issue is probably because of the SVG but what do I have to change to make it work?