I am working on a Drupal instance installed with French as default language and English as an additional language, administration pages language in English. When I add an English translation to a basic page, the original French version becomes inaccessible. Clicking on the edit button of the original French page always opens the edit form of the English version. The only way to edit the original is to delete the English version or change the admin pages language to English.
Install Drupal 9.4.8 in French.
Add English language.
Set your user language for Administration pages to English.
Enable content translation and configure it with basic page: translatable/default settings.
Create a basic page in French. Insert a title only and save.
Edit the page -> Translate -> Add English version. Change the title and save.
Now there are two instances of the page. Click on Edit the original (French) version.
It opens the English version.
Being able to edit the original page.
Closed: works as designed
9.5
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
@rhy: "Account administration pages" always overwrites your URL language detection in admin area. Activate "Customize Content language detection to differ from Interface text language detection settings" in /admin/config/regional/language/detection and activate URL detection below.