Minecraft Version: 1.12.2

Forge 2517

*Inventory Tweaks Version: 1.63 *

Cavern_1.12.1-v1.10.2.jar

Client log -
[17:26:25] [main/INFO] [inventorytweaks]: Automatic stack replacement.

Cavenic monsters and Randomite ore from the Cavern mod drop magical books with unknown spell. If you hold RMB for a few seconds the revealed book is supposed to drop on the floor.

What actually happens is that the book gets replaced with another already revealed book (using Akashic Tome) so the new book is essentially destroyed.

This may be just an issue of Cavern randomly destroying my items but it seems to be related to IT.