The injector in question should be replaced with an @Inject or MixinExtras' @WrapOperation, as both of those allow stacking of Mixins.

Are there any mods which you know that mix into AbstractArrow#tick so I can test it in my dev env?

The mod i work on, https://www.curseforge.com/minecraft/mc-mods/jcraft-eyes-of-ender, does this for gravity manipulation support.

dunno why it didn't automatically close the issue
but yeah it seems to now work with your mod and others which mix into AbstractArrow#tick()