Not sure if this is intentional or not, but hanging from a hook attached to the top of a blade of grass is pretty weird; might be better to use the normal collision filter for normal projectiles.

I don't know if this would work but you could try it. https://www.curseforge.com/minecraft/mc-mods/swingthroughgrass

I actually already happened to have that mod installed; it doesn't affect hook behavior. Thanks for the suggestion though, was a good idea.