FFL Trinkets Compat
This compatibility mod is designed to resolve conflicts between the Trinkets and FallFlyingLib modifications (as well as any other mods using this library). The issue is that elytra capes placed in the corresponding slot stop functioning due to technical incompatibility between the Trinkets Mixin component and the FallFlyingLib library.
If you have both of these modifications installed - FallFlyingLib and Trinkets, this compatibility module will restore the correct operation of standard elytra.