A Duck

You are not really sneaking though, you can still sneak. This position has no sneaking properties.

I don't think this is a bug. It finds a valid teleport location, which is land, or the ground.

Grass paths in the snaps were changed in code. Not changed in 16.5

All copper and amethyst were gone since 1.16.5 is not part of the 1.17 series, so you basically sort of downgraded. All path blocks are gone since they were changed to "dirt paths" in the snapshots and they had code changed. Cauldrons are the same with the new snow and lava ones. Boats and frames also had their code altered in some way.

I have the exact same thing to say as Ralf. 

Yep, bundles only allow as many items that make one stack of that item

No code is implemented for golems to be friendly.

I think this works as intended.