Not that bitwarden is alone in this, many apps handle this badly, but I’ve quite frequently found that after docking or undocking my laptop bitwarden winds up placed off-screen with no way for me to get hold of it again other than by killing it and starting a new instance.
In addition I’ve also regularly seen the b/w window become HUGE when it’s woken up on a high DPI display when it had gone to sleep on a low-DPI display.
Ideally it should check the display dimensions each time it’s asked to render and verify that it’s actually on the physical desktop somewhere (and move to a sensible default localtion if it finds it’s not) and has a sensible window size regardless of the DPI of the display device.