5033 VST3 w/C7.5.3 - deletes time!

While using - Shift and adjusting the settings - Deletes time in the project - sometimes. All audio gone. Undo undoes it of course, thankfully. Disconcerting to say the least.
Perhaps while dragging with Shift for subtle adjustment if dragging outside the window of the 5033 with a mixer behind it is when it occurs. I haven’t had this problem with other vst plugins.
VST 3.5 version