The top-leftmost book's top looks glitchy

[TJT01]

Describe the bug
The top of the top-leftmost book in normal and rainbow shelves has a weird z-fighting-like effect.

Screenshots or crash report (if relevant)

Versions (please complete the following information):

• Minecraft: 1.18.2
• Mantle: 1.18.2-1.9.31
• Inspirations: 1.18.2-1.3.0.9

[KnightMiner]

Can't reproduce: