Cube maps must be square.

Author: mrdoob

src/nodes/lighting/PointShadowNode.js

@@ -207,7 +207,7 @@ class PointShadowNode extends ShadowNode {
 		const cubeDirections = isWebGPU ? _cubeDirectionsWebGPU : _cubeDirectionsWebGL;
 		const cubeUps = isWebGPU ? _cubeUpsWebGPU : _cubeUpsWebGL;
 
-		shadowMap.setSize( shadow.mapSize.width, shadow.mapSize.height );
+		shadowMap.setSize( shadow.mapSize.width, shadow.mapSize.width );
 
 		//