I noticed that the onlyoffice app didn’t start showing following error:
podman[2849767]: Error: cannot re-exec process to join the existing user namespace
A workaround is to remove the file pause.pid, see also podman commands fail when run as non-root user with "Error: cannot re-exec process" · Issue #14635 · containers/podman · GitHub
Remove the right pause.pid, following example removes pause.pid for instance onlyoffice5:
rm /run/user/$(id -u onlyoffice5)/libpod/tmp/pause.pid
Now the app should be able to start again.