i would probably watch out for scale rot with a 90% humidity, but if it is short term, it should be okay. a humidity of a little lower or higher should not be harmful for a couple of days
I more so associate scale rot with wet/damp subtrate more so then humidity, but high/low/fluctuating humidity could also cause concern for a RI to pop up. Not by any means saying that it WILL but more so that it MIGHT. Just my 2 cents on that.