I noticed this with two different sets of keybinds.
Change toggle perspective to "r", crouch to caps lock, sprint to shift.
To recreate:
 press and hold caps lock and w, then press r, this does not change your perspective as it should.
Second version:
Hold shift and w, now hold caps lock, - This does not cause the player to crouch as it should and like it does when the keybinds are default

(side point I'd like it if sprint overrode crouching so the last button you pushed down is what you do but that's more of a feature request than a bug)