I want to bring this up, but I'm getting this bug where if this mod is combined with other mods, it causes the white placard in the core game to vanish.

here's some proof

please look into this and if possible, try to resolve this minor bug

I'm having the same problem... but this time with the Placard from the original Create, it doesn't appear in the creative in the search bar (On the left it is a Minecraft without the addons of other mods and on the right with addons)

Edit: As an extra piece of information, you can still craft the item itself, although it doesn't show it in the JEI, if it does show it when you assign it... it's very RARE...