I am facing the same issue. But it is not at the spawn location. It is inside a cave, some distance away from my spawn location. Unable to place or mine in a region. My friend who has hosted the server is able to mine it though
I've tested this bug, I spawned a wolf in creative changed to survival, I hit the wolf and the angry wolf didn't do damage, I tried in each difficulty and he still doesn't damage the player. This bug is confirmed by me.
NOTE: I tested this bug using a Windows 7 computer.
I am on an iPhone Xs and facing the same issue.
OS Version: iOS 14.3
Minecraft version: v1.16.201