I noticed that undo sometimes does not work correctly for certain tracks. I haven’t yet pinpointed what it requires for the bug to appear, but when it does editing is broken and the visuals are weird. A restart luckily fixes it, typically (another small issue: sometimes restarting quickly doesn’t seem to save the very last state and uses a slightly earlier one)
Here I deleted the selected track and pressed undo afterwards. The ‚restored‘ track has a weird black floating icon and the clips are invisible. Sometimes its effects can also not be edited anymore (it says something with cubasis being in the background or similar).
While playing, the track’s output is still audible, but editing is broken obviously.