Its simply not in gui, but available trough /give . Using version 1.20.1-1.10.0.4
Is that a bug or intentional? In case ill provide logs or something, but i dont think i need to as i saw alot of people having this issue. Im just posting it here to hopefully know why its not here

Ah, this is the first time I actually have heard of this.
I think I just forgot to include it in the creative menu.

I'll release a fix for this sometime soonish.