Linux Fedora 36 was released yesterday and already we have upgraded one data backup server, one file server, one dual boot laptop and are midway through another file server. So far so good, no issues with the inplace upgrades.
The command line sequence as root goes like this:

dnf upgrade –refresh
dnf install dnf-plugin-system-upgrade
dnf system-upgrade download –releasever=36
Transaction Summary
Total download size: 4.4 G
DNF will only download packages, install gpg keys, and check the transaction.
Is this ok [y/N]:
dnf system-upgrade reboot
dnf system-upgrade clean
dnf clean packages
dnf upgrade
Fedora 36 upgrade complete!