What happens:
When mobs (Players, Villagers, Golems, Zombies, Creepers...) are in scaffolding, between two ladders or vines, they lose their collision with other mobs. Hitbox still works for attacks (punching, projectiles...)
Expected behavior: Collision inside of scaffolding should be the same like anywhere else (on the ground, in water, in the air...)
EDIT (21.11.2020): This also leads to maxentitycramming not working here, as no pushing can go on here, just like against ladders and vines.
Code analysis
Code analysis by @unknown can be found in this comment.
Linked issues
is duplicated by 4
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Comments 13
Added vines and ladders to the bugreport as it is (now) the same story there. No way to push mobs off them...
@Anthony Cicinelli
Ok, didn't know that, but why is the feature not restricted then? Should I open a meta bug report about this jira? If the ticket owner can change something, it seems to me like it should be utilized to cut down on sorting work needed. I use a Jira elsewhere too, and there, anything that is not supposed to be changed by the normal users is simply not a visible field.
Will not do it in the future, but the fact that this has not been fixed yet tells me, that some measures are needed to even get it remotely noticed/categorised in the first place.
This bug could be due to the ladder/vine making the game think that all entities in the block space are climbing?
Please check if this is still an issue for you in 1.16 Release Candidate 1 or later.