Derfius
10
I took the screenshot of the map to show where the followers were currently stuck. The map screenshot was taken as I was already leaving the area in frustration, I just figured it might help to show where they were. In that location are some black ice nodes but also some monsters. When this glitch happens (multiple times now consistently) the monsters do not attack either. They make the sound and may animate slightly before being stuck in place and just letting me kill them.
If you follow the ridge west from the follower’s icon on my map screenshot, there is a (golem?) mini boss somewhere there. Originally coming from the Highlands, the followers managed to make it onto the ridge for that fight and a few ice rocknoses in the first area where you encounter ice nodes, taking the ridge from “Skyfall Ridge” East-North-East towards the volcano. At this point the followers are already struggling but when you get to that fight they eventually pop up. After that, they simply do not follow any further but at some point (after I have already passed the area) they pop up where you see the icon on my map screenshot.
Continuing on to the Hidden Way as you see in the screenshot the followers simply stay stuck. Entering the first Obsidian nodes beyond the Hidden Way, the monsters will function and the followers will pop into the area but not fight or defend themselves.