I tried adding Better Portals to my modpack I'm working on, and it crashes on loading a sp world.
Logs: crash-2021-02-09_08.20.31-server.txt
I tried removing Nether Portal Fix, but the issue still happens. I'm on the latest version of forge for 1.16.4.

Looks like it's some sort of capability-related issue with the Shrink mod

I have the same crash and if it is Shrink... I will just wait for it to be compatible. (Because the kids and I want shrink more...)
crash-2021-02-23_08.33.26-server.txt
debug.log

Forge 36.0.42 and BetterPortals-1.16.4-0.3 (And too many mods to list sorry about that... blame my kids lol)

Try v0.3.1 to see if it fixes this issue for you.

Thank you it seems to be working now. ^_^