Hello,
There was an issue linked to languages where the builder was displayed in the language of primary language pre- v2.2 and not in the language selected in the settings. This has been fixed with V 2.2. However, now, the language of the content is always displayed in the language of the builder.
My case: I edit a website which primary language is French. I setup the builder to be in English, as this is my preference. I can only edit the English page. If I click to edit the French page (the default), it opens the English content.
This is the link I clicked on (containing the lang=fr):
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This is the resulting page that I can edit:

The URL contains /en/, editing the EN page. I need to switch the setting to French for the builder to edit the FR page.
I am using WPML for localisation.
Thanks and best regards,
Philippe