I started opening PRs for plugins, that should only be merged after the foreman-js & foreman core update.
Right after releasing the new foreman-js version, with pf5, some plugins might break (before merging the pf5 pr in them) as they dont specify which version of foreman-js to use and will use the latest.
Redmine tracker: Tracker #37745: Update to Patterfly5 - Foreman
Most plugin updates are pretty small, except for Katello (which changes almost 200 files).