See issue 5 of Soul Fire'd.

Most probably sihywtcamd latest 1.18.2 version does not include commit c032277b48b02a09d38efd957e3c99c23f550d6f that fixed incompatibility with other mods.

Thanks for the report! You're totally right, I fixed it on 1.19.x versions.
I will try to back port the fix quickly then!