This bug is there for more than a year, I believe. EVERY time I open DeoVR (and ONLY when I open DeoVR), while still in the passcode screen the headset briefly displays the message "Your space might be too dark". Of course, my space is not too dark and the Quest 2 tracking continues to work normally, despite the message.
Just a minor annoyance, but I thought it was worth reporting.
Quest 2, standalone version.