When I tried to join my single-player world, it crashed and according to Not Enough Crashes, it seems that your mod was causing it.

Log:
https://pastebin.com/mcFCe58c

I'm using Artifacts-1.16.5-2.8.0 with Forge 36.0.30

After further investigation, it seems that it is an incompatibility with Optifine, as it works fine without it.

Try updating Artifacts, the latest patch should fix this issue