Menu blocks specific to Navigation are leaking into the Block layout UI

Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to our policies.

MR created including basic test coverage.

I've successfully reproduced the issue and reviewed the Merge Request !10338 on the 11.x branch. I also applied the patch without any problems, and the pipeline is passing. changing status to RTBC. (please see attached screenshot)

Committed/pushed to 11.x and cherry-picked to 11.1.x, thanks!

This doesn't apply cleanly to 10.5.x due to the OOP hooks merge. I think getting navigation to stable in 11.1/11.2 is more important than backporting to 10.x, so I'm going to mark this fixed, however if someone wants to backport it to 10.5/10.4, please re-open with a backport MR.

catch → closed merge request !10328

Automatically closed - issue fixed for 2 weeks with no activity.