Wondering what could have caused these black edges on this variegated Monstera?

It was outside all spring and summer, then had to come inside abruptly without adjusting due to a sudden frost warning. It wasn't exposed to the frost. I don't believe it got too cold the nights before either. I had other tropicals outside as well and all seem fine. Could the lack of adjustment to indoors have caused it? There was previously black fluid coming from the spots when touched, but that has since stopped and they're now dry. Nothing else has changed. No repot, no change in watering. Just the move from outside to inside.

Any thoughts? Hoping it's something that won't spread...

@Gina1960

Just moving it from out to in shouldn't make a bit of difference unless perhaps there was a huge change in the humidity or the amount of light hitting that white sectorial variegation. You know that large patches of white like that break down fast because they don't produce cholorophyll, right? It would have eventually happened even if you hadn't moved it