Unfortunately, this is going to be very hard to reproduce in a babylonjs playground, b.c we use a custom shader, but please bear with me.
We generate a cube texture from the current scene using a camera in the middle of the room, and then point it in the six direction of the cube. Everything about that seems good. The edge seem to line up. as you can see from attached photos. We sample from that cube texture in the shader to do reflections. However, as you can see from the first image, the reflection appears warped where images cross from the -y plane to the +x plane (or the -x, +z, or -z plane). Are there any settings on the cube textures, or approaches to creating the cube texture, that we can do to avoid this warping effect where you can tell that the reflection cubemap switches planes?