Before Continuing:

• Check you are using the latest version of the mods and its dependencies
• Always include a latest.log if you are crashing
• Remove mod that enhances Minecraft: Optifine, Sodium, others. The issue persists.
• If you are unsure which mod is the culprit.
  Disable all of your mods and enable them 1-2 mods each time to isolate the culprit
• Confirm that there is no existing issue with a similar description submitted in the list of issues.

Version

1.21.1-FABRIC

Supplementaries Version

supplementaries-1.21-3.0.37-beta-fabric

Moonlight Lib Version

moonlight-1.21-2.17.30-fabric

Describe Issue

Books, enchanted books, and books with quills are not placeable. They do not display the tooltip for placeable and cannot be placed.

I am well aware. No tooltip means it's off. That's why mod is in beta. Closing as duplicate of many similar issues