upside-down stairs no longer display proper shadows on inner front-facing surfaces.

Steps to Reproduce:

1. Place an upside-down stair under a ceiling or in a shadowed area.

2. View the stair from directly in front of the recessed face.

3. Note that the front-facing recessed face is fully lit instead of shadowed.

Expected Behavior:

The entire inner surface (upper and vertical recessed faces) should be shadowed to reflect lighting accurately and maintain stair geometry clarity.

Observed Behavior:

Only the upper recessed part is in shadow. The vertical inner face appears overly bright, flattening the block’s appearance and making it look like a full block.

Notes:

• Issue began after enabling Vibrant Visuals.

• Happens in all worlds after that point.

• Reinstalling the game does not fix it.