Quick answer: Construct 3 tilemap with rectangular tiles producing skewed collision shapes? Default collision masks assume square tiles - configure per-tile masks for non-square.
Isometric-ish tiles 64x32 px. Collision shape stays 64x64; objects fall through the bottom 32 px.
Per-tile collision
Image editor > per-tile collision polygon. Author the right shape; instances use it.
Or use object overlays
For complex shapes, invisible solid objects per tile. Collision is on the object; tilemap is visual-only.
Verify via collision debug
Run-time overlay of collision shapes. Mismatches with tile bounds = the bug source.
“Default collision assumes the obvious shape. Non-square tiles need explicit shapes.”
For non-square tile games, build a tile-collision template. New tiles inherit the right shape; bugs stop recurring.