Entity Reference Revisions Select List Widget doesn't save

The patch in #12 works well for me.

Tested the patch with Drupal 10.0.1 core with the Paragraph module. The Paragraph entity reference field allows us to provide Checkbox/Radio options in the management form. The patch was applied cleanly without any issues. Am surprised that the test cases failed.

Attached screenshot for reference.

Thanks for the patch, #12 works well for us on Drupal 9.5.10.

Thank you for the patch in #12 @tstoeckler

We had the same issue, and it worked great.

We had to re-roll the patch to apply against ERR 1.10. Attaching new version here.

Re-rolled #11 for D10 compatibility.

This really needs tests when it introduces so much new code.

I had the same issue with en entity reference revision inside a paragraph bundle. I tries the patch against bith 1.10 and 1.11 with no luck (event if the patch applied well).
I found the workaround for my case whitch to recreate my field as an Entity reference instead of an Entity reference revision (in my case i have no need form term's revisions).