modifyCreativeTab not working properly

[gentle stone]

StartupEvents.modifyCreativeTab('building_blocks', event => {
event.addAfter('minecraft:warped_button', 'mynethersdelight:powdery_block')
})

I wanted to change the order of blocks in the creative menu, but the blocks were inserted in a completely different place. There is no such bug on fabric 1.20.1, everything works as it should. This only happens on forge 1.20.1 and neoforge 1.21.1. I haven't checked other versions. Is it possible to fix this? Thanks in advance.

[rain cape]

Once your ticket has been resolved, please close it with </ticket close:1054771505520717835> command!

[reef lodge]

I also ran into this issue on 1.21.1 neoforge