devtrackers.gg
Yeah, I loaded the Circuit and left to eat something, when I returned there was a timer and a big warning telling me to kill remaining enemies, leading to the mission failure.
I guess it uses the default "Fail mission after 15 minutes with no kills" that some missions use.
This was highly likely the case, we're aware of it internally and we'll have a fix for it at some point in the future - Host migration bugs to squash in the meantime!