Thank you so much for pointing this out!
I didn’t know timeline selection had this effect at all. Somehow I wasn’t considered in Legion timeline despite never getting out of Broken Isles.
After reading your post, I went back to Chromie and reactivated the Legion timeline.
I had no idea this was supposed to be the case, I thought timeline selection was just a quest starter and didn’t affect the leveling experience at all.
This is, different, yeah.
Thank you so much for your help!