This issue cannot be replicated on clientside (using integrated servers}
whoever, on dedicated side this becomes in a very annoying thing

this has a specific way to trigger it, you need to make a dedicated server (with redirector on the both sides), move some chunks away (to unloaded/ungenerated parts, wait to get generated and then place sand (the most noticeable bugged block), holding right click on a placed block causes sand get placed on adjacent sides of the block

water is also affected, placing water sometimes breaks the fluid physics, and makes them a mess (placing water above, removing it and then placing it back, no spilling it). Depending of the water's mood, sometimes 1 block of water becomes in a huge mess of fluctuing water

restarting server fixes the issue ON GENERATED CHUNKS.

after removing the mod, repeating the steps above many times doesn't longer replicates the issue.

I was testing this on my modpack, but i can perfectly replicate the issue standalone

this was tested on

• WINDOWS 11
• MinecraftForge 40.2.21
• Java 17 (microsoft edition)

also having this issue on a dedicated server only. LAN server works fine but this happens randomly when a dedicated server is up, and will need to be rebooted for it to work again.

Transfer to MCTeamPotato/Kasualix-Issue-Tracker. Given the current situation of Kasualix, your case may not be processed in a timely manner.