Question blocks from the mods desappear istantly when placed

[Dadda]

So, the issue is that i downloaded a few mods on my minecraft server (version number 1.20.2 forge and even the mod pack that i created is for the forge version).
In my server i can see loaded my all my mods but for example: if i want to place a block from one of the mods it desappears istantly.

 

[electronicboy]

This is paper, we can't help with issues relating to software that has nothing to do with us