Audacity 2.4.1 - Solo function has changed or regressed

I have 10+ tracks in a project and I want to Solo on two tracks. In earlier builds, clicking Solo on selected tracks just worked. Now in 2.4.1 clicking Solo on one track is muting all tracks and I am unable to Solo selected tracks.

You should be able to change the behavior of the Solo button.

Edit > Preferences > Tracks > Track Behaviors > Solo.