When some field content is deleted from an already Translated Content Entity it is not reflected in its Translations updates.
The field is still present with the same (translated) content from the previous version/revision ...
This happens to me both in the source Content and both in Paragraphs (or other fieldable entities) attached/referenced to the source Content.
This is a general problem that we are experiencing, and also with referenced Paragraphs: when a Paragraphs field is updated as empty, its translation update will still include its previous translation.
From my TMGMT inspection it looks to me that these issues are caused from the logic used to update Content Entity existing translations, from the tmgmt_content submodule, in the Drupal\tmgmt_content\Plugin\tmgmt\SourceContentEntitySource::doSaveTranslations method: https://git.drupalcode.org/project/tmgmt/-/blob/8.x-1.x/sources/content/...
If the Content Entity Translations already exists then ONLY the fields part of the new incoming translations data are updated ...
Instead it could be appropriate, in case of already existing Translation, always remove it (along all its already existing and translated fields) and recreate it from skracth with the new incoming translation ones: as a result only the fields part of the new updated translation will be part of the updated Entity Content Translation, that would perfectly match its source updates, also in terms of deletions.
Needs review
1.0
Core
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I see that, for such cases the ui does detect that the field item was removed.
Was wondering if it could be possible to "uncheck" the row so that it is not considered for translation. I tried adding an empty field value, but it won't allow me to submit the form :)