when I enter abyss portal I get sent back and forth infinitely. at least until other player breaks portal. I checked server log and it says moved to fast then sends back where it says moved too fast.

Set "Portal Teleportation Cooldown" to a higher number.

Closing this now. If setting the config option mentioned above to a higher number doesn't solve it, update to a newer version of the mod (1.9.4.2 and anything after that version shouldn't be affected by anything like this).

In creative mode I entered a portal, and am stuck in said loop in version 1.12.2-1.9.4.6