As far as we know, something crashes / resets the physics engine. We haven't been able to reproduce it yet, if you know a way to trigger it intentionally, please contact me.
So i did some research about this bug well first i saw this. https://gmod.facepunch.com/f/gmodhe...orld-brushes-falling-through-displacements/1/ This basically describes the physic bug that we currently have. So here is the intersting part (screenshot from the link above) He has the same bug and mentioned ShouldCollide, so i search for other bugs that includes ShouldCollide and i found this. https://github.com/ValveSoftware/halflife/issues/1685 https://github.com/dreamstalker/rehlds/issues/46 https://forums.alliedmods.net/archive/index.php/t-228677.html Here is a screenshot from the 2nd link. Here is a screenshot from the 3rd link. So from what they say i assume that the funcion pfnShouldCollide hook returns to false instead of continue the loop and that cause some bugs in the physic. I dont know if this will help the devs to fix the problem but i think is better than nothing. Edit: personally it makes sense to me now the pfnShouldCollide hook returns to false and that breaks the game also if you dont move your tank it dont give a update to the client so maybe thats why the tanks that doesnt move dont fall. but still i dont know if we can reproduce it on purpose because is seems like the pfnShouldCollide hook returns randomly to false which breaks all the collisions. also i dont know if this is client side or engine based