I didn't find Honest Hearts to be too buggy, only a few times where creatures would clip through terrain. I've never heard of the map marker thing, but it sounds pretty bad, corrupted save maybe?
And one thing that bothered my OCD is that its just Zion, not New Zion (sorry, if I didn't say it it would bother me for a bit).
Glad to know I'm not the only one with OCD about things like that