I can not confirm for 1.18.1. According to MC-234117, which is a related report, it still happened in 1.18. Unless someone else can confirm that both bugs are still active, it might have been fixed.
I can confirm for 1.18. What I found interesting when I saw the bug is that the zombie did not jump on the nearby moss block either. I will put a screenshot of what I am talking about on this report.
That is odd. MC-224454 did not come up when I tried searching for any bugs that related to azalea. That is probably what through me off. Sorry for the duplicate.
Make sure there is a snapshot with the debug screen enabled. To enable the debug screen, press F3.
Are you using the new launcher? There have been quite a few problems with the new launcher. If that is the case, this bug might be part of that.
I have no clue how to describe this either. Have you tried reloading minecraft?
It means that while it might be a bug, it won't be fixed. I'm not sure why it won't be fixed though.
It isn't quite a duplicate of MC-1797 because this is a report of a version of Minecraft after 1.16. It definitely seems related though. However, it still might get marked as a duplicate or invalid because emerald blocks were added sooner than 1.16.
It might not be a duplicate to MC-237986, because wither skeletons still apparently spawn if the farm is removed. Also, the snapshots were taken in a hardcore world if that has anything to do with it. Can anyone confirm that this is an issue?
This looks like a duplicate of MCPE-16292; however, that is a bug report for a different edition of minecraft. Does that still mean it is a duplicate?
Please make sure the debug screen is enabled in at least one snapshot. If you don't know how to do this, press F3, and then take the snapshot.
Edit: So in a previous comment, I claimed that the debug screen was turned off in the snapshots shown. I now realize that the debug screen is shown, but it was just really hard to see. I have deleted the previous comment because of this error.
I do apologize for not having that screenshot sooner. This is my first bug report, and I did not realize that the debug screen was required. Thank you for the feedback, and I fixed this problem as of 8/9.
Switching to "Fabulous!" graphics did work to fix the problem. I should have said that I used "Fancy" up above earlier. I did add the change as of 7/19. Anyway, thanks for the help!
FYI, I have a screenshot of the wither skeleton skull surrounded by gray glass panes in creative mode to show how it should work.
Similar to MC-232282, I can not confirm in 1.18.1. It might have been fixed.