Scripting simple double doors, they work in forge, but never close right in custom games. There’s always more gap, they don’t close all the way, they stop short of returning to their original positions.
Lighting isn’t what it looks like in forge. In a custom game, everything is much darker, even if you forge with generated light.
Objects shift out of place, such as floors, walls, decals. Lighting is green, usually keep everything in the green.
Shadow and light from windows placed on maps with sun light create a terrible flickering/conflict (Alpine)
Objects get "sucked outside of the buildable area, kill you, and the object is stuck there taking up budget.
Spawn Plates/Volumes players in custom games always spawn in close proximity of eachother regardless of spawn order, volumes, LOS, danger etc.
Players leave a custom game, the game lags, or freezes for a moment or longer, constant leaving and joining in a public lobby is terrible.