Charts and reverse thrust

(this is within VR, full screen)
i’m finding that if i interact with the charts in vc and try to engage reverse thrust (mapped to a key press, F2), reverse thrust does not work. only after i click on the vc with the mouse pointer (like changing the focus from the charts window to the vc), would the reverse thrust engage.

is this the expected behavior? seems all other keys like arm spoiler, a/p, etc. work fine even when the charts window is in ‘focus’ but the reverse thrust key is the only exception for some reason…