Not sure if this has been reported elsewhere, since the Search function for the forum seems to be broken: After Hiding Parallels Desktop 3038 via Apple+H and then coming back to it, the Control key is engaged and stuck. Very tedious when doing any typing, because if I Hide PD then come back every R, P, etc. wants to invoke "Run," "Print," etc.
This happens for me too! Glad you narrowed down the bug exactly, now at least I can avoid hiding parallels until it's fixed.