I upgraded Docker Desktop for Windows to version 3.2.1 today and now Pi-hole won't start. I'm getting an error saying that port 53 is already bound. Apparently the fix/workaround to this is to downgrade or roll back to version 3.2.0. I hope the issue gets fixed in the next Docker Desktop for Windows update.

Update (16 March): Pi-hole now works on Docker Desktop for Windows version 3.2.2