Core/Auras: added sanity checks for area auras having a different owner unit than caster

Port From (https://github.com/TrinityCore/TrinityCore/commit/6c642f33b58ce81eb5b1345a7f0eb89de6040251)

Source/Game/Spells/Auras/Aura.cs

@@ -965,9 +965,21 @@ namespace Game.Spells
                 return false;
 
             // Check if aura is single target, not only spell info
-            if (GetCasterGUID() != GetOwner().GetGUID() || IsSingleTarget())
+            if (GetCasterGUID() != GetOwner().GetGUID())
-                if (GetSpellInfo().IsSingleTarget())
+            {
+                // owner == caster for area auras, check for possible bad data in DB
+                foreach (SpellEffectInfo effect in GetSpellInfo().GetEffects())
+                {
+                    if (effect == null || !effect.IsEffect())
+                        continue;
+
+                    if (effect.IsTargetingArea() || effect.IsAreaAuraEffect())
+                        return false;
+                }
+
+                if (IsSingleTarget() || GetSpellInfo().IsSingleTarget())
                     return false;
+            }
 
             if (GetSpellInfo().HasAttribute(SpellCustomAttributes.AuraCannotBeSaved))
                 return false;
@@ -2547,6 +2559,9 @@ namespace Game.Spells
                 }
                 else
                 {
+                    Cypher.Assert(caster != null, $"Area aura (Id: {GetSpellInfo().Id}) has nullptr caster ({GetCasterGUID()})");
+                    Cypher.Assert(GetCasterGUID() == GetUnitOwner().GetGUID(), $"Area aura (Id: {GetSpellInfo().Id}) has owner ({GetUnitOwner().GetGUID()}) different to caster ({GetCasterGUID()})");
+
                     // skip area update if owner is not in world!
                     if (!GetUnitOwner().IsInWorld)
                         continue;

Source/Game/Spells/SpellManager.cs

@@ -2962,6 +2962,13 @@ namespace Game.Entities
                     if (effect.TargetA.GetSelectionCategory() == SpellTargetSelectionCategories.Cone || effect.TargetB.GetSelectionCategory() == SpellTargetSelectionCategories.Cone)
                         if (MathFunctions.fuzzyEq(spellInfo.ConeAngle, 0.0f))
                             spellInfo.ConeAngle = 90.0f;
+
+                    // Area auras may not target area (they're self cast)
+                    if (effect.IsAreaAuraEffect() && effect.IsTargetingArea())
+                    {
+                        effect.TargetA = new(Targets.UnitCaster);
+                        effect.TargetB = new();
+                    }
                 }
 
                 // disable proc for magnet auras, they're handled differently