We're well past the days of everything in ImmersiveMC being "full-bright", yet the lectern's immersive book remains fully lit! This should be fixed, and presumably the held book suffers the same issue.

Downporting time!

• 1.20.4
• 1.20.2
• 1.20.1
• 1.19.4
• 1.19.3
• 1.19.2
• 1.18.2