As per the question title, each time I activate CSDTool, I note that bluetooth is turned on but not turned off when CSDTool is closed.
Why is bluetooth turned on when activating CSDTool?, a bug, or a feature?, seems more like a bug to me.
There are bluetooth tests, maybe should shut down after closing to behave ‘normally’ (wlan and gps do not stay on after)
edit: on Xperia 10 III it doesn’t stay on, just whole connectivity is off until you airplane mode on-off, but it resumes as previously, so looks like device specific as on jollaC BT would remain on from what I can recall