What is your operating system? Windows 10
What is your Shotcut version? 23.11.29
I’m honestly not sure this is a bug. Maybe it’s just something you forgot to mention in the release notes. Worth reporting anyway I guess.
In the release notes of v23.11.29:
It - the Automatically Add Tracks feature - only adds tracks when you add something to the timeline or move a clip between tracks.
In addition to this, when a clip is alone on a track, moving it left or right will also create a new track.
If it’s a bug, I’m sorry I didn’t noticed it before the release…