I've tried version 1.14.4 and 1.15.0 #1245. In both versions, I throw the 6 switches so that the paintings on Shadow Wood are bright but the door to the portal that goes to the Hypostyle won't open. The only way to continue is to noclip. After noclipping through the door I can use the portal but at least one thing doesn't work right there. The Wayvern gets stuck at the bottom of the column in the middle of the lava. I've tried it a few times and he always gets stuck.