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Brooo you are in 1.12 why do you made mods on 1.12 in 2024 anyway i have similar issue in 1.20.4 in mi case to fix i have to make the BlockEntity to manually call on blockEntityChanged() to inform the world the block entity has change and need to be saved // ########## ########## ########## ########## @Override protected void saveAdditional( CompoundTag nbt ){ //System.out.println("\n##saveAdditional(), " + this.getBlockPos() ); nbt.put("inventory", itemhandler.serializeNBT() ); nbt.putInt("progress", this.progress ); super.saveAdditional( nbt ); //System.out.println(NbtUtils.prettyPrint(nbt)); this.getLevel().blockEntityChanged(this.getBlockPos()); //<---------- } but this is in 1.20.4 may theres something equivalent in 1.12

tysm! thats finally fixed it for me youre amazing!

it worked thank you, i just had to delete java 22 through apps & features

It works fine now. thank you

Both screenshots showing Java 22 Remove Java 22 and make sure the server is using Java 17

I can confirm a similar error when trying to set up a 1.19.2 modding environment in Eclipse; something is definitely cached that doesn't do well when the environment is edited. I solved it similarly to how you did, by simply restarting from the ground with a different project in a different version.