Let Litematica be able to paste tile entity data of block / entity data in a server
By using a custom chat packet to bypass the chat length limit so the client and simply append the tile entity or the entity nbt tag to the /setblock or the /summon command
You need to install it on both client & server to work.
For the client-sode, it requires litematica mod only. For the server-side, it requires nothing
You need to set commandUseWorldEdit to false and pasteNbtRestoreBehavior to None in litematica for this mod to work, if these 2 options exist in your litematica mod
Tile entity data won't be pasted again if the block state matches the schematic though