Version Information

Forge version: Used TL launcher Forged optifine 1.14.4
Botania version: Botania r1.11-378.jar

Further Information

What I expected to happen: Will receive mana coated diamond

What happened instead: Nothing instead, the diamond disappear, there wan an animation but then nothing.

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something probably picked it up. try in a clear area with no items or blocks from other mods around.

Just to add to what Williewillus said here, when I first installed Silent's Gems, I had this same problem. Turns out I just wasn't paying attention to my Gem Pouch from that mod, which was auto-picking up the Mana Diamonds. Check all of your inventories and sub-inventories.