Sulfur and cinnabar stairs have texture issues when they are corner stairs

This glitch makes it look like the stairs have an extra line for no reason when connecting

How to reproduce the issue

1. Place cinnabar or Sulfur stairs upside down

2. Place the other variant of upside down stairs facing the top into the first stairs but not letting the bottom parts touch

3. The second stair block will connect to the first stair block causing a texture issue where a line appears and it looks like a chunk has been flipped

Expected results

Stairs connect and are smooth textures

Actual results

Stairs connect but have a texture issue at the spot where they connect