It seems op wants to have areas that can’t be reached not have colliders for performance, but still wants his bullets to be able to register hitting them for placing a decal on the collision.

Very cool! Debating on remaking some heartbeast tutorials for Godot 4 (specifically the prodcederul tile generation with a walker and tilemap to 3d level + optimizations). Curious if people would be interested in that or not though, thoughts?