When player in Survival mode using Spectre Key from mod RandomThings he teleported to Spectre dimension.
Through, when im using my tweaked configs of UT, player is stall in void dimension forever. Resetting configs to defaults (removing Universal Tweaks - Tweaks.cfg) fixes issue.

There is normal behavior with resetted configs:

And there is behavior of with my custom configs:

Note that issue is instantly fixed if player game mode changed to creative:

There is changes i made for better visualize:

~bugged-to-default-unbugged.patch

Notes:

• Defaulting only Max speed values does not helping to fix issue
• No server stall detected (TPS is normal, server responsive)
• We already had similar issue that was fixed Krutoy242/Enigmatica2Expert-Extended@b3e539b
• Clientside configs changes doesn't matter

server debug.log

Would require binary-searching to determine the exact config setting. When that's supplied, I can come up with a solution.