Core/Auras: Corrected logic used to determine if a spellmod should affect another spell, empty family name or class mask should not apply to any spell

src/server/game/Spells/SpellInfo.cpp

@@ -1539,6 +1539,9 @@ bool SpellInfo::IsAffectedBySpellMod(SpellModifier const* mod) const
         return false;
 
     return IsAffected(affectSpell->SpellFamilyName, mod->mask);
+    // TEMP: dont use IsAffected - !familyName and !familyFlags are not valid options for spell mods
+    // TODO: investigate if the !familyName and !familyFlags conditions are even valid for all other (nonmod) uses of SpellInfo::IsAffected
+    return affectSpell->SpellFamilyName == SpellFamilyName && mod->mask & SpellFamilyFlags;
 }
 
 bool SpellInfo::CanPierceImmuneAura(SpellInfo const* auraSpellInfo) const