Given that there haven't been other appearances of this bug since 2017 and I haven't gotten any new mods since last update, I'd say this must have to do with the newest version of skyrim SE. I can't find any solution to it either, including disabling as many mods as I could without breaking my save
Companions - Aela won't transform and Skjor won't enter the Underforge
in Skyrim LE
Posted
Given that there haven't been other appearances of this bug since 2017 and I haven't gotten any new mods since last update, I'd say this must have to do with the newest version of skyrim SE. I can't find any solution to it either, including disabling as many mods as I could without breaking my save