1. Create any node and translate that node.
2. Now delete translated node.
3. you can check original language node got deleted
Postponed: needs info
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I can confirm the issue on Drupal 9.4.x, the issue is indeed related with ContentEntityDeleteForm is being responsible of deleting the entity. Skiping the alter for delete forms as in #3 seems like a solution and fixed the issue for me.