Playing Brawl mods in netplay via the boot.elf method doesn't work in newest builds?

[Blacknite08]

I'm trying to play Smash Bros Infinite with my friend. The last time we did netplay was with 5.0-9224 and it worked just fine then. But on the latest version, if I host boot.elf in netplay, Dolphin crashes. We both tested to see if we could run the Brawl mod offline first and it still worked.

Update: I've also tried booting GeckoOS in netplay through the main.dol file and by using the Homebrew Channel. In both situations Dolphin crashes before GeckoOS boots up.