The result appears to be somewhat map dependant. E.g. a custom model trench (same edge and floor positions/distance as right case in test mission) - on Malden it produced identical problem like in test mission. On VR map however, players dont get stuck on the floor after edge contact. Players only get stuck on the edge for a fraction of a second in VR in this particular case.
custom model is this [[ https://abload.de/img/deathtrap7mji0.png | Custom Model.png ]] (bottom is roadway). Various things with roadway and geo lod have been tried to get rid of the problem, without success.