I hate to link to reddit, but it was the only place I found people reporting the same issues I was having since the update (and some before), all in this post, to save you a click:
Since halfway into Days of Color, I am getting strobing effect at the 8 player puzzle area. This starts at the moment we would expect to get the normal cutscene from that area, about 15 seconds after the platform elevator brings us there. Now, it fades to white, fails to show the cutscene, and keeps trying; white fade x rinse wash repeat. Only once, I somehow got to "skip" the cutscene, and that did fix it, but only that one time.
As of today, version 0.26.1 update, Grandma's buns launch high into the air immediately upon spawning, and even if you somehow manage to fly up there, they cannot be burned. Tried two Grandmas; same result each time.
Bonus glitch, also very recent, in the Vault of Knowledge, on the floor with the Mother Manta, once the lanterns are removed from her, and the portal opens, you can sit inside, but you go nowhere. Game just pans out, very slowly, to a far distance. This one at least has a band-aid solution; you can close the game (or henge to home), respawn in home, and jump into the "most recent area you've been" portal, and it will take you right to the next floor, where you can complete the Vault.
(added this in the edit) It seems the campfires that used to give social light balls have stopped so doing. I've tested Cozy Cave in Daylight Prairie, and zero light. Currently in the middle of testing the one in Hidden Forest (Brook map, near the entrance to Grandma), and will eventually test the one in the temple maze within Valley of Triumph. This issue started today, with the release of 0.26.1 (Edited again, after checking the afk social light campfires) I didn't get any light from Cozy Cave and Hidden; I did get one ball of light from Temple Maze. If the campfires are giving light, it seems to be much less than before.
One good piece of advice I found in the comments and confirmed works:
For the 8 player puzzle area just open the map shrine there and the bug will stop