Minecraft version: 1.16.5
Forge version: 36.1.24
Environment: Singleplayer

Mod name: Better End Forge
Mod version: 1.16.4-1.6.0
Mod name: Nether Portal Spread
Mod version: 1.16.5-5.1

Description

The Better End's end portal is treated as a nether portal in regards to spread.

Thank you for opening the issue and giving the mod a try! This has been fixed in version 8.0 of Nether Portal Spread. Apologies it took so long for me to get to.

https://curseforge.com/minecraft/mc-mods/nether-portal-spread/files