Source data filters suddenly show up blank in the web UI

Firefox 123.0 released on Feb 20 does this for me using the filter set mentioned below on Feb 23:

Edge browser is what I usually use for Duplicati. It’s fine. What’s your browser version? Got other?

I managed to get two Firefox versions on one little-used system using its 122.0.1 install plus 123.0 installed from PortableApps.com. Going to the same old Duplicati, only the new one had the issue.

EDIT:

It’s ultimately the text version that matters, and you can certainly copy it out for safety if you wish to.
I did a small test of adding another exclude beyond the set of mostly empties. Save and revisit to do glance at Edit as text looked about right, and Edit as list looked as empty as it was before…

This probably needs to be looked at by someone who does JavaScript. Maybe a visit to Bugzilla for Firefox will turn up a clue. I couldn’t find anything in a Google search, but I only used general terms.