TYPO3 link always resolve to default language - typo3

Question

I recently upgraded from TYPO3 ver. 8.x to ver. 9.x and I am currently running 9.5.20.
We have a setup with 3 languages: DE (default), FR, IT
since the update, no matter what language you are currently on, every typolink leads to the default language.
the typolinks are stored in the database like this:
<a href="t3://page?uid=686">...
some random tidbits that might help narrow the problem down
the 404 page works correctly and is always shown in the right language
the only links that work correctly are the ones used by the blog extension
here are some configurations that might help solve the issue
the config.yaml file
additionalGetParams: ''
base: /
baseVariants:
-
base: 'https://www.example.com/'
condition: 'applicationContext == "Production"'
-
base: 'https://www.example.com/'
condition: 'applicationContext == "Development"'
connectTimeout: 0
debugErrorPageRequestException: false
disableCertificateVerification: false
disableStatisticsRecording: false
errorHandling:
-
errorCode: '404'
errorHandler: Page
errorContentSource: 't3://page?uid=141'
forceLanguage: -1
languages:
-
title: German
enabled: true
base: /de/
typo3Language: de
locale: de_DE.UTF-8
iso-639-1: de
navigationTitle: Deutsch
hreflang: de-DE
direction: ltr
flag: at
languageId: '0'
-
title: English
enabled: true
base: /en/
typo3Language: default
locale: en_CH.UTF-8
iso-639-1: en
navigationTitle: English
hreflang: ''
direction: ''
fallbackType: strict
fallbacks: '1,0,2,3'
flag: en-us-gb
languageId: '1'
-
title: French
enabled: true
base: /fr/
typo3Language: fr
locale: fr_CH.UTF-8
iso-639-1: fr
navigationTitle: French
hreflang: fr-CH
direction: ''
fallbackType: strict
fallbacks: ''
flag: fr
languageId: '2'
-
title: Italian
enabled: true
base: /it/
typo3Language: it
locale: it_CH.UTF-8
iso-639-1: it
navigationTitle: Italiano
hreflang: it-CH
direction: ltr
fallbackType: strict
fallbacks: ''
flag: it
languageId: '3'
passAuthinfoToInsecureConnections: false
passthroughContentTypeHeader: false
requestTimeout: 0
rootPageId: 21
routes: { }
trustInsecureIncomingConnections: false
setup.typoscript
config {
// Language Settings
sys_language_overlay = 0
sys_language_mode = content_fallback
language = de
locale_all = de_CH.UTF-8
htmlTag_setParams = lang="de-CH" dir="ltr" class="no-js"
sys_language_uid = 0
language = de
defaultGetVars {
L = 0
}
[globalVar = GP:L = 1]
config {
sys_language_uid = 1
language = en
locale_all = en_GB.UTF-8
htmlTag_setParams = lang="en" dir="ltr" class="no-js"
}
[global]
[globalVar = GP:L = 2]
config {
sys_language_uid = 2
language = fr
locale_all = fr_FR.UTF-8
htmlTag_setParams = lang="fr-CH" dir="ltr" class="no-js"
}
[global]
[globalVar = GP:L = 3]
config {
sys_language_uid = 3
language = it
locale_all = it_IT.UTF-8
htmlTag_setParams = lang="it-ch" dir="ltr" class="no-js"
}
[global]
any help or hint would be much appreciated.

Answer 1

I think TypoScript conditions like
[globalVar = GP:L = 1]
are not working anymore as of TYPO3 9.
Could you try the new syntax like
[siteLanguage("languageId") == "1"]
https://docs.typo3.org/m/typo3/reference-coreapi/master/en-us/ApiOverview/SiteHandling/UseSiteInConditions.html#sitehandling-inconditions