Not surprising! NO greenhouse is immune.
Nothing likes ups & downs, but they are especially bad for propagating & seedlings. And not much help to toms etc.
Don't know, but wouldn't have thought that your other things would come to much harm.
Common sense dictates here, I think. Do what you think sensible, like ventilate, when you can. Even to add some more insulation at night? But you don't want to be ruled by the thing?