Consider using : "item": "minecraft:arrow" would be most appropriate choice since tag "minecraft:arrows" would lead to using tipped arrows / modded arrows with different arrow head materials / spectral arrow into normal arrows with fire.
Also, for coal, minecraft do have tag "minecraft:coals" which will be applied to both coal / charcoal and include compatibility with modded coals too.
It is my suggestions, please feel free to do otherwise if they are against direction of the mod. ~
Versions:
Observed Behavior:
The fire arrow can't be crafted. Reason from using unknown tags "tag": "forge:arrows" in recipe json
Expected Behavior:
The fire arrow should be able to be crafted with intended recipe
Steps to Reproduce:
Log: https://gist.github.com/Ritzumi/401216dab8226447c1c138c1ee44292f
Additional Info
Consider using : "item": "minecraft:arrow" would be most appropriate choice since tag "minecraft:arrows" would lead to using tipped arrows / modded arrows with different arrow head materials / spectral arrow into normal arrows with fire.
Also, for coal, minecraft do have tag "minecraft:coals" which will be applied to both coal / charcoal and include compatibility with modded coals too.
It is my suggestions, please feel free to do otherwise if they are against direction of the mod. ~