I don't know, but it happens to me occasionally too with a 'Moonlight' philodendron. The theory that seemed most likely in my case is that I was letting it get too dry between waterings, but I've never definitively proven anything.

My banana does that when I bring it in and it does make a mess like purple stated, mind would drip alot at night,so first thing in the morning I would dry the leaves to stop more dripping.

I started my first peppers recently and noticed they close at night, I thought maybe they are sensitive plants that close if they get cool or it gets dark.

corkball, I have clay soil.......and there are veins so heavy and white it could be used in a horse shoe pit. I avoid those, lol. For the most part, I plant trees in it without issue and never with ammendment. I am careful, however, to consider the tree because some are less tolerant of water issues for the most part and I get around it by planting those on hillsides, of which I have many. That's why raised bed planting comes up. I dunno......the chestnut I suspect you may find be futile and may want to consider waiting until dormancy and if it's small enough to try and move it. If you do.....look at roots carefully. It may have been a dead man walking when it was planted. Why I am saying this is I'd hope that the newest growth would show signs of "pulling out if it". And that doesn't seem to be the case. In fact it looks almost as if the newest growth has some leaf curl and distortion compared to the other picture of the healthy oak. Sometimes that's a symptom of calcium deficiency and that can be exacerbated by magnesium applications, foliar or root. How large are these young trees?