Can confirm, have been doing exactly what GP says is a world of pain with no problems as soon as I learned what `:z` and `:Z` do and why they might be needed.

A good reference answer: https://unix.stackexchange.com/questions/651198/podman-volum...

TL;DR: lowercase if a file from the host is shared with a container or a volume is shared between multiple containers. Uppercase in the same scenario if you want the container to take an exclusive lock on the volumes/files (very unlikely).