Before Continuing:

• Always check you are using the latest version of the mods and its dependencies
• Remove mod that enhances Minecraft: Optifine, Sodium, others. The issue persists.
• If you are unsure which mod is the culprit.
  Disable all of your mods and enable them 1-2 mods each time to isolate the culprit
• Confirm that there is no existing issue with a similar description submitted in the list of issues.

Version

1.20.1-FORGE

Supplementaries Version

supplementaries-1.20-(2.7.30-2.7.33)

Moonlight Lib Version

moonlight-1.20-29.3

Issue Detail

I'm use a server with mohist system (Mods + Plugins). If you claim a plot with GriefPrevention or WorldGuard, player they can't place blocks but books they possible to place but world get latence and deny place however books drops and drop with duplicate process.

Any mod that does something like call set block on way that those plugins have not thoguth out are bound ot not work with those. Those are meant to be used in vanilla as they handle all vanilla cases but with mods there will be many many of such occurrences. I know when I added Flan compatibility I had to add a bunch of API calls to flan itself to check that myself. In other words only way to fix this is to add direct compatibility which I do not really plan to do as I have already that for flan mod. On top of that even if I wanted I couldn't because it's a plugin. Don't use plugin with mods, plugins are nothing more than serverside mods and using them with forge is essentially having 2 modloaders at the same time which will have many issues. Use proper server side forge mods instead