I have content type with paragraph reference field.
I can create node with en-int original language and de translation
Then if I want to create de-DE translation based on de, I can select translation source language on translation edit form. In such case new translation will be based on selected language, but paragraph translations are based on original language.
In entity_reference_revisions_entity_revision_create we can check if entity has content_translation_source field and try to load source language translation of the target entity to use as source for new translation
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