If you were to create a hole or a cave using the Visibility option in Landscape Mode, vehicles will be unable to travel properly and teleport up to the normal terrain. Video showcasing the bug here
The player as well as vehicles being underground can happen due to issues with the level geometry, and the game code detects this and respawns the player and/or teleports the vehicle to resolve this.
If you deliberately want to allow players and vehicles access underground, you need to place a so-called “Fort Underground Volume” that tells the game that it is okay for the payer/vehicle to be there. This volume is available in the “Place Actor” menu (see “Window > Place Actor”).
We will amend the documentation to clarify this behavior.
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