TR_Travels placed a TempleMarker at Vos to prevent the player from shooting off to Ranyon-Ruhn from northeastern Vvardenfell
Of course TR_Travels got deprecated and its TempleMarker disappeared with it, so currently the player will end up in the middle of Map1 when using ALMSIVI Intervention in that part of Vvardenfell
Which is far more intrusive to the base game than adding a marker to Vvardenfell is, IMO

The last couple of times that it came up on Discord people seemed to be in agreement about adding it back, but so far it hasn't happened yet