Hostile mobs with their heads in transparent blocks are not attacking the player

works as intended, because mobs can't see through glass, they can't see while their inside glass.

Does not work as intended as you can see in MC-122988 it has been classified as "Works As Intended" that mobs can see while in transparent blocks like glass.

This seems to affect non-hostile mobs as well, see MC-133687.

Hi violine1101 🙂

I do not think MC-133687 is a duplicate of this bug here, please take a look at my post there.
But you are right, even non-hostile mobs with their heads in transparent blocks, do not attack hostile mobs.

To be clear, I just want to know what behavior is now "Works As Intended". Can mobs see if their head is in a transparent block or not? If not then the "WAI" classification is incorrect for MC-122988 .

Can a mod confirm this bug report, so that we have a chance to get a statement from the devs?

Can confirm in 20w49a.

I'd like to ask for a bit of clarifications on this issue since has not been updated in a while. Is the problem you are describing that entities cannot target and persue the player, or cannot attack the player?

From my own test, I was able to be attacked by a zombie with it's head stuck inside of glass, but the zombie did not target me until I provoked it. This is the behavior I observed:

Can confirm in 1.20.3 Pre-Release 2 with the behavior of the hostile mob not actively persuing the player without prior provocation, although as stated in my comment it's currently unclear if that is actually the intention of the issue.