I was playing like usual and suddenly after dying by an archer the wings stopped working. I have them on my back but I cannot glide. I also even try to remove my wings and craft them again but I cannot use them neither

This is a FallFlyingLib bug, which (hopefully) be superseded by an official Fabric API module: FabricMC/fabric#1815

Once the module is merged, I'll work on a version that uses the Fabric API module and this will (hopefully²) be fixed.