Internal Server Error and Disconnect when using Teleporter

[tobeins]

Hi, I'm playing AOF 3 on a server with a couple of friends. It's AOF 3 Release Version 2.4.4 and MC 1.16.4 . We built two teleporters so we could visit each other more easily and the first one works just fine, however the second one doesn't. We linked the shard and placed it in the Teleporter multiple times, however when you step on the TP and sneak you instantly get disconnected with a message saying 'Internal Server Error' . Even worse, we can't break the TP, it just goes invisible when destroyed with a pickaxe, but it's still there and once the chunk is reloaded it's visible and back where it used to be.
Help greatly appreciated, thanks in advance :)