Not Jahiera, but some others. Yes, withers,the hirings and shadowheart. In addition to my game going crazy
Same here. Haven't seen this on Jaheira but on others. It's also not always them stuck in the ground, but sometimes they'll levitate slightly above it. Happened last night with Withers when I went to camp after first picking him up. Speaking with him and/or doing my first re-spec fixed this.
I've also (rarely) seen this happen while moving around in the game-world. A character would be running around with the ground at their knee- or even waist-level and in the "right" terrain they could become fully "submerged" if you moved them to certain spots on the map. Fast traveling and/or going to camp would usually fix this. Since it's only ever happened once or twice in all my play-throughs, I've no idea what caused this and I also haven't been able to re-produce the behavior.