Every time I use a portal to go to and from Undergarden, a new portal is created

I am playing a superflat Void world when I saw this bug, I tried remaking the portal by checking the coordinate (overworld divided by 4 seems to be the rule), but even then it just pop a new portal right next the the one I made in the Overworld (OW portal at -26:20, made an UG at -6:5, return to a new portal at -25:22 OW portal was North-South, made the UG portal the same, new portal is East-West)

Minecraft 1.18.2
Forge 40.1.73
Undergarden 0.7.1
Lot of other mods, full list here

Having a similar problem on 1.20.1. It drops me in the middle of nowhere when leaving the Undergarden, generating a new portal ~40-50 blocks south and ~30-40 blocks east of the original location.

NetherPortalFix fixes the issue.

I have the same issue in a custom pack of mine. This has a list of the mods me and Drakray has in common:
https://pastebin.com/0G0T2YiU

I'm like 90% sure that this is an issue with Radium breaking POIs. Try removing that mod, or at the least adding the line mixin.ai.poi=false in Radium's config file.

Removing Radium does not work(tried the config first, didn't work either)

Same problem here :(

I got the same problem in version 1.19.2 .

As @Burning-Cactus mentionned, I added the line mixin.ai.poi=false in Radium's config file since I happen to also have that mod, then I installed the NetherPortalFix mod.

Now there isn't a portal generated every time I travel to the dimension.

I haven't tested for 1.18.2, but it might work on that version.

Unsupported version. Two years old. Closing.