I tested a little bit and find out that:
After you go into map2 from map1, you cant return, same bug.
If you load on map2 from console, and return to map1 (which you can), you cant go to map2 from map1
And for some reason, after i moved triggers a little bit on map2 and map3, when you load on map2 and go to map3, game just crashes.
I would like to mention that i use Spirit Of Half-Life 1.8, but this bug was even before i start using sohl1.8
Link to rmfs (Google Drive)
(The only thing that this maps uses from sohl1.8 is giving a player suit at the start, so maps works well in vanilla hl)