Stumbled upon a bug
(running current VoidDreaming-V0.07.12PR-pc version).
On day 2, after I caught Mizz and Bromm on the Observation deck, I stayed, but refused Mizz's offer for sloppy seconds.
Then on day 6 got to MIzz's event where he goes "I'm not making a mistake, am I?" (I think it's MizzS2)
And he said: "I know you were there, that time on the observation deck. There's no use in hiding it."
Probably a wrong state assigned to d2MizzBrommCaught variable somewhere, but I didn't bother to dig further. Variables with non-binary numeric values are a headache to troubleshoot.