Information

PaperMC 1.13.2 b541
EssentialsX 2.16.0.46 b703

Details

Description
/condense command does not turn Melon Slices into a Melon block, and instead prints the message below:
You have no items that can be converted into blocks.

Steps to reproduce
Have at least 9 Melon Slices and type /condense

Expected behavior
Condense the Melon Slices into a Melon block

This is not working because Reverse crafting is also validated, and you can't craft a melon block into melon slices

This is intended - as Xeyame correctly pointed out, you can't craft both ways between melon blocks and melon slices, so it isn't a valid /condense type.

Closing as a duplicate of #1431.