Related to this bug

Why was it removed? It really limits map makers when creating maps. This was the best way to prevent neutral creatures from wandering off from their starting position. Now you have to isolate them with dirt blocks. Without neutral defences you can't make a  scenario map where you have no workers and the only way of increasing your army is  moving around the map and finding neutral units. In skirmish maps you could use neutral defences to defend neutral shrines.

I don't remember doing anything unusual...

Yes.

I can't reproduce the bug. Must have been a one time glitch.

Every unit is affected by this bug. Try possessing a unit and move around without touching the mouse. Wrong direction that the possessed camera is facing is fixed when you move your mouse.

So, where should I leave feedback?

Related to this bug.

Yes, I'm sure.

The obsidian texture glitch is all over the Demonic park map.