Mud

AE currently seems to have some kind of instability issue with HDT FSMP and NPCs, and I encountered at least one crash related to it and Dynamic NPC Replacer that doesn't occur on SE when I attempted to move my loadout to AE, so there are still obscure problems out there. It's also likely there are probably also some issues in the opposite direction that only occur on SE, though.

Hag's End seems like a location that needs to be excluded? I got sent there with the Captive Start and escaping involves going through Deepwood Redoubt, which has an Expert locked door in the way that you're meant to open with a key when going through the normal way. Seems very easy to get trapped here without lockpicks.