Long time lurker, first time poster. Did a search, didn't find anything similar to this.
Earlier today I got Harrison Jones and deactivated my Ahm to make room for him, who was attached to my enchanting building. Just a moment ago I looted work orders from my enchanting building (which no longer has Ahm working at it) and Ahm still gained experience.
Steps:
1. Have follower attached to a profession building
2. deactivate this follower from the mission table
3. Loot work orders from profession building
4. Follower gained experience