Mobs' pathfinding breaks when on waterlogged top slabs

Affects 20w13b

still present in 20w16a

If there's carpet on top of the waterlogged halfslap, it completely stops the mobs pathfinding and they will stand completely still.

I'm not able to reproduce this any longer in snapshot 20w20a.

Can someone else confirm that it's no longer occurring?

I still see this on 1.16.4. It also seems to prevent villagers from breeding or using a work block

Hostile mob pathfinding: https://www.youtube.com/watch?v=UweKHv-XSn8

Sam Carlberg

In that video, you were using Optifine, therefore making your statement invalid. I can confirm that this issue no longer occurs in 20w51a. Mobs have no trouble pathfinding over waterlogged upper slabs.

Can confirm that some part of it still occurs. They can move just fine, but they might start spinning randomly.

Can confirm in 1.17.

Can confirm in 1.17.1.

Here are some steps on how to go about reproducing this. I've also attached a video demonstrating this issue.

The Bug:

Entities have difficultly pathfinding when standing on waterlogged top slabs.

Steps to Reproduce:

• Summon some waterlogged top slabs beneath you.

/fill ~10 ~-1 ~10 ~-10 ~-1 ~-10 minecraft:cut_copper_slab[waterlogged=true,type=top]

• Summon a cow on top of the slabs.

• Attack the cow and watch its behavior closely.

• Take note as to whether or not the cow panics upon being attacked.

Observed Behavior:

Entities have difficultly pathfinding when standing on waterlogged top slabs.

Expected Behavior:

Entities would not have difficultly pathfinding when standing on waterlogged top slabs.

Can confirm in 1.18.1.