Information

Minecraft version: 1.21
Modloader: NeoForge
NeoForge version: 21.0.147

First mod name: Easy Elytra Takeoff
First mod version: 4.4

Second mod name: Elytra Slot
Second mod version: 9.0.0+1.21

Feature description

Easy Elytra Takeoff does not seem to work with Elytra Slot, which allows the the Elytra to be equipped on a back slot and is the only mod available that does so on 1.21. It'd be really nice if these two mods were made compatible with each other.

Edit:
I also want to note that I'm using Accessories for the extra slots along with its compatibility layer for Curios.