I encountered a very serious bug on the server.
The archive of the redstone machine that will produce BUG has been packaged and placed in the attachment.
The redstone machine contains a large number of block entities and redstone components. When the redstone machine is running, it will generate a large number of redstone signals, water flow updates, and entity generation.

Bug reproduction steps:
1. Enter the world after loading the archive to the server
2. Transmit to coordinates: x=7 y=141 z=21
3. Pull down the lever
4. Go to the ground below the redstone machine
5. After placing the block, destroy it or throw something out to reproduce it

After turning on the Redstone machine, three bugs will appear:
1. The hopper timer under the machine will get stuck, making it impossible to activate the circuit behind it;
2. If the operation of the hopper timer is restored, and the redstone machine is operating normally and spawning monsters, throwing items in the loading area (press Q) may cause the thrown items to be lost, or The operation of destroying the block in the loading area may cause the corresponding block to not fall, that is, the block will disappear directly after being destroyed;
3. After the hopper timer resumes operation, the water flow in the middle of the redstone machine will be abnormal, that is, the water will penetrate the trap door or not disappear.

We have tested on the original server of Minecraft, Bukkit server, Spigot server, and Paper server. This problem did not occur on the original Minecraft server and Bukkit server, only the Spigot server or the Spigot server This problem occurs in server-side development based on end-to-end.