[0.8.2c] I had this as well. I've gotten SKerfurO, an Ariral that decided to kick me over for whatever reason (didn't even know they were in ambient), and the Forbidden Fast Shadow Figure (but that one makes sense bc June 28, 9pm requirement-- though the other date specific event didn't happen on the 24th sooo....).
I play Ambient for the times when none of my friends are available to be an emotional support human while I play story, so the fact events are leaking REALLY sucks.
Happy my transformers at least go down now to break the signal collection loop though. That's nice