When opening studio on an empty baseplate (nothing in startergui has been changed either), the studio mouse icon will always be the UI hover icon, regardless of:
selected building tools (select, resize, translate, transform, rotate, etc)
ui editing/selection state (dragging/resizing a guiobject)
selected/hovered-over instance
Attached is a beautifully-produced video that showcases this bug:
This bug appears to have already been flagged by another post, and marked as resolved after a flag was flipped off.
However, the issue appears to have re-emerged recently as there are several other posts made by other forum members made within the last three days that also address this issue.
Assuming it can be resolved with just switching a flag on/off, myself and a plethora of others hope to see this fixed soon!!
Just started experiencing this today, thought it was just my computer at first and did a reboot + reinstall of studio only to find the issue still present. Hoping to see this resolved soon!
A fix for this should be in the next release of Studio. Will circle back after the release and check if this issue still occurs. Sorry about any inconvenience!