Undo Mixer Glitch

Hey there MuseScore community,

I'm using Windows , Arch.: x86_64, MuseScore version (32-bit): 2.3.1, revision: 0899e9d and I noticed a small funny thing which apparently wasn't documented yet (and wasn't a feature of previous versions I think).

I became finished and saved. When removing instruments over the menu - which is opened with the key 'i' - , not saving, then exporting the changed version with removed instruments as MP3 and finally undoing the removal, the mixer will stay in the state of removed instruments. The instruments aren't re-added in the mixer after undoing. This affects playback (also instant playback of clicking the notes) too which treats the re-added instruments as muted or non-existing instruments, however the instruments are displayed. Easy soft fix is reopening the project but as I remember, I didn't find it in previous versions.

Btw, before removing the instruments, I muted them with the Mixer, if that's important to know. Prior to the version I use I would have muted the channels and exported the audio afterwards. I don't remember whether the previous version also exported every channel with these settings but also muted channels were exported which I didn't expect, so I removed them.

I very appreciate all your work, your patience and maintenance which you put into this gem of a freeware.
Have a very nice day, MuseScorers!