My world is not modded and I used default settings. I also chose Wendy as my character I started in Spring. During Summer (around day 28-30) I went into the caves to collect some lightbulbs. I was overheating as I entered the caves. As I explored I started to freeze. I left the caves during Dusk of Day 31 and there was snow on the ground and a snowbird by the entrance, so apparently it had turned Winter sometime while I was exploring the caves.
I was looking forward to Autumn (and I was not particularly prepared for winter). As far as I can tell this bug has been reported as early as 2016. I hope something can be done to fix this on Switch and other platforms because suddenly skipping a whole season is a big deal.
Edit:
I saw someone saying they only had this problem when first entering a cave. Re-entering wouldn’t trigger a season skip. I tested this out. I re-entered the cave I had entered before an exited. There was no season change. The next in-game day I entered a different cave. I started picking grass in the sunken forest when before my eyes it started to wither along with a berry bush. I had a good feeling it turned summer as soon as I entered the caves. Turns out it absolutely did turn summer. And since I started freezing while spelunking the first cave for the first time I can only assume it had turned winter immediately after entering the first cave as well. So the problem with my save is that whenever I enter a new cave system, a season is skipped. I changed the steps to reproduce accordingly.
Also, I have entered the caves a total of three times, and each time there was a hound attack a day later (the cave entries were not far apart from each other in time; the second two were a day apart so that’s two hound attacks and two days). Each hound attack contained only one hound. The first two had a normal hound and the last one had a fire hound. There should be at least two hounds each attack and they should not be a day apart. Clearly this has something to do with me entering or exiting the caves.
Create an ROG save with default settings and Hamlet enabled on a Nintendo Switch. Choose Wendy as your character. Enter a cave system you have not entered before.