Mobs spin / cannot pathfind while they are on scaffolding

Actually The Mobs Can't path find through or on scaffolding
They'll treat Scaffolding like a solid block in the same time they treat it like air when they have to walk on it

New findings from MC-158275: If the scaffolding is floating, mobs behave as if it was air. While standing on it, their (pathfinding) AI seems to not function (they're waiting to fall down). If there are blocks around the scaffolding, they'll walk along those, but won't walk onto the scaffolding blocks.

If there are blocks below the scaffolding however, mobs will enter it, as they believe that there are blocks one layer below that they can stand on. However, they don't fall down as they expect, but are standing on top of a block that they don't know how to pathfind from.

I attached a video showcasing the behaviour with floating scaffolding a bit:

This is probably just a special case of MC-150293 MC-157645.

Um... you mentioned this ticket, twice...
You likely meant a different one...

Can confirm in 21w10a.

If there are pathfindable blocks directly beneath the scaffolding mobs can pathfind ontop otherwise not.

Can confirm in 1.19 and 1.19.1 Pre-release 1.

Can confirm in 1.19.2.

In 23w32a

Can confirm in 1.21.4 Pre-Release 2. Affects Creakings as well.