Not compatible with Inline Entity Form

Worth pointing out that this is for the 2.0 branch of IEF which is currently highly not recommended. Comments in the issue queue linked indicate it works in 1.0.

Whether or not it'll crop up again in 3.0 in the future is beyond me taking a glance at it. I don't think warrants a major status.

Has this been tested with the 3.0 branch of IEF?

3.0 and 1.0 are nearly the same codebase. I'm still running 1.0 so can't confirm, but:

https://git.drupalcode.org/project/inline_entity_form/-/commits/3.x
https://git.drupalcode.org/project/inline_entity_form/-/commits/8.x-1.x

The patch mentioned in the original report was for 2.0