Aliases are lost when entity language is changed from the edit form

This issue is being reviewed by the kind folks in Slack, #needs-review-queue-initiative. We are working to keep the size of Needs Review queue [2700+ issues] to around 400 (1 month or less), following Review a patch or merge request → as a guide.

Can confirm the issue following the steps in the IS.
The patch cleanly applies to 10.1 but the MR needs to be updated please

This issue appears to be a duplicate of 🐛 Language-specific aliases only work with url-based language negotiation Needs work , could we close this one? I have already added this fix to that issue.

Will move over credit.