Minecraft, modloader and mod versions
Example:
Minecraft: 1.20.1
Fabric: 0.15.9
Soulslike-Weaponry: 1.1.3

Forlorn-Scythe doesn't fire projectiles.
The scythe collects souls, but the projectile doesn't leave, although the projectile model appears for a split second and then disappears.
One day, when I entered my world, the weapon suddenly started working properly, but after a few shots, it stopped firing again.

I couldn't record a video to show you what it looks like

I left a link to the modpack disk:
https://drive.google.com/drive/folders/1yqDNx_zrPOqhSGi2UFqBZLXvxL7tCyB6?usp=sharing

I used a translator, so there may be some misunderstandings.

I hope you were on a newer version than 1.1.3 as you have stated in your post, if not I suggest updating to the newest mod version and see if that helps.

Regardless, did it stop working even though you had souls on it? It could be a desync from the server/lag if it worked some times and other times didn't, especially if you say that the projectile model leaves then disappears. Could be another mod preventing it from spawning correctly. If updating doesn't work then I suggest looking into which mod causes the conflict by launching minecraft with some of them removed and then add them later and see if it still works.

I I was wrong. I have the latest version installed. I'll try running Minecraft without some mods.

Any news?

Gonna close this due to inactivity, make another post if the cause is soulsweaponry.