Bug with Max backup speed for local/passive transfers" set

I am setting up backups for a new department. Using UrBackup server 2.5.33 on Ubuntu 22.04lts installed via apt.

If I put any value in “settings->local/passive clients->Max backup speed for local/passive transfers” and then try to add/remove a client to a group I get a modal dialog with the error:

backups:55141 says
Format for max backup speed for local network wrong. Please correct."

A forum search shows several issues that seem similar, but not exactly the same.

Work around is to clear that setting, add or remove the clients, then re-add the setting. The setting does work for me.