Special characters not working despite UTF-8 in Response Header [closed] - encoding

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In my AngularJS app I'm using JSON translation files, which get loaded into the app via HTTP requests. I see that HTTP requests in the network, and in the Preview I see that the content is corrupted (special characters are not shown correctly (see screenshot below).
However, in the Response Headers I see that it's encoded as UTF-8 like this:
content-type: application/json;charset=UTF-8
However, the special characters are not shown correctly:
I did another test and uploaded the file to another server and opened the URL (from the other server) as well.
The strange thing is, that on the other server the same file works perfectly and the characters are shown correctly, so it must be some server issue.
Also, when I download the file and analyze its encoding, it says UTF-8 in both cases (on the working server, and also on the non-working server).
Is there any server configuration which might prevent from delivering the file in a correct format?
The server where it's non-working is an nginx server.
The Response Headers:
accept-ranges: bytes
Connection: Keep-Alive
Content-Encoding: gzip
content-language: de-DE
content-type: application/json;charset=UTF-8
Date: Tue, 07 Feb 2023 09:10:44 GMT
etag: "63c9737f-eb86-gzip"
Keep-Alive: timeout=15, max=100
last-modified: Thu, 19 Jan 2023 16:44:47 GMT
Server: Apache
strict-transport-security: max-age=31536000
Transfer-Encoding: chunked
vary: Accept-Encoding
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
Request Headers:
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate, br
Accept-Language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7
Cache-Control: max-age=0
Connection: keep-alive
Host: www.something.de
If-Modified-Since: Thu, 19 Jan 2023 16:44:47 GMT
If-None-Match: "63c9737f-eb86-gzip"
sec-ch-ua: "Google Chrome";v="105", "Not)A;Brand";v="8", "Chromium";v="105"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Windows"
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: none
Sec-Fetch-User: ?1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36
Raw contents of the file:
unsigned char ucDataBlock[344] = {
// Offset 0x00000000 to 0x00000157
0x7B, 0x0A, 0x20, 0x20, 0x22, 0x72, 0x69, 0x65, 0x73, 0x74, 0x65, 0x72,
0x2E, 0x70, 0x65, 0x72, 0x66, 0x6F, 0x72, 0x6D, 0x61, 0x6E, 0x63, 0x65,
0x50, 0x65, 0x72, 0x63, 0x65, 0x6E, 0x74, 0x2E, 0x6D, 0x65, 0x73, 0x73,
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};
Could anyone help and point me to a possible problem please?