If you try to drag an element that was placed in a group after the the group has been rotated, the element goes haywire and disappears. I recreated the bug in the attached hype project. Move the playhead to 1 second and select Rectangle1 or Rectangle2 and try to move it on the canvas.
bug.hype.zip (11.7 KB)
Confirmed, that is strange. It didn't disappear, but it went way off of the stage to the right at ~3000 + on the ruler
Thanks for reporting this!