Ports from (https://github.com/TrinityCore/TrinityCore)

Core/Unit: don't clear low health aura states on death
Core/Gossip: Fix gossip bug on modify money
Core/Spells: Change the radius of PBAoEs following the feedback received on
Core/Player: update interaction checks, some info taken from client
Core/Spell: abort channeling if no valid targets are found after searching
Core/Creature: fix _DespawnAtEvade saving wrong respawn time
Core/Spell: fixed some problems with per caster aura states
Quickfix a bug introduced by 2f19d97 which prevented GTAoE from being cast.
Core/SmartAI: allow SMART_ACTION_SEND_GOSSIP_MENU to override default gossip
Core/Spell: in case of immunity, check all effects to choose correct procFlags, as none has technically hit
Fix evade issues when a spell hits the target just before evading.
Scripts/Command: implement .debug play music command
Partial revert, Unit::getAttackerForHelper() shouldn't return units that we aren't in combat with (victim can be such a unit for players/player pets, which can startattack from a distance without entering combat).
Fix an issue where CanSpawn would never get invoked on creatures without per-guid script.
Core/Players: fix null dereference crash

Source/Game/Entities/Unit/Unit.Combat.cs

@@ -376,6 +376,11 @@ namespace Game.Entities
             if (IsTypeId(TypeId.Player) && IsMounted())
                 return false;
 
+            Creature creature = ToCreature();
+            // creatures cannot attack while evading
+            if (creature != null && creature.IsInEvadeMode())
+                return false;
+
             if (HasUnitFlag(UnitFlags.Pacified))
                 return false;
 
@@ -436,7 +441,7 @@ namespace Game.Entities
             if (meleeAttack)
                 AddUnitState(UnitState.MeleeAttacking);
 
-            if (IsTypeId(TypeId.Unit) && !IsPet())
+            if (creature != null && !IsPet())
             {
                 // should not let player enter combat by right clicking target - doesn't helps
                 AddThreat(victim, 0.0f);
@@ -445,8 +450,8 @@ namespace Game.Entities
                 if (victim.IsTypeId(TypeId.Player))
                     victim.SetInCombatWith(this);
 
-                ToCreature().SendAIReaction(AiReaction.Hostile);
-                ToCreature().CallAssistance();
+                creature.SendAIReaction(AiReaction.Hostile);
+                creature.CallAssistance();
 
                 // Remove emote state - will be restored on creature reset
                 SetEmoteState(Emote.OneshotNone);
@@ -536,12 +541,28 @@ namespace Game.Entities
         }
         public Unit GetAttackerForHelper()
         {
-            if (GetVictim() != null)
-                return GetVictim();
+            Unit victim = GetVictim();
+            if (victim != null)
+                if (!IsControlledByPlayer() || IsInCombatWith(victim) || victim.IsInCombatWith(this))
+                    return victim;
 
-            if (attackerList.Count != 0)
+            if (!attackerList.Empty())
                 return attackerList[0];
 
+            Player owner = GetCharmerOrOwnerPlayerOrPlayerItself();
+            if (owner != null)
+            {
+                HostileReference refe = owner.GetHostileRefManager().GetFirst();
+                while (refe != null)
+                {
+                    Unit hostile = refe.GetSource().GetOwner();
+                    if (hostile != null)
+                        return hostile;
+
+                    refe = refe.Next();
+                }
+            }
+
             return null;
         }
         public List<Unit> GetAttackers()

Source/Game/Entities/Unit/Unit.Spells.cs

@@ -3965,9 +3965,22 @@ namespace Game.Entities
                     ToTotem().SetDeathState(DeathState.JustDied);
             }
 
-            // Remove aurastates only if were not found
-            if (!auraStateFound)
-                ModifyAuraState(auraState, false);
+            // Remove aurastates only if needed and were not found
+            if (auraState != 0)
+            {
+                if (!auraStateFound)
+                    ModifyAuraState(auraState, false);
+                else
+                {
+                    // update for casters, some shouldn't 'see' the aura state
+                    uint aStateMask = (1u << ((int)auraState - 1));
+                    if ((aStateMask & (uint)AuraStateType.PerCasterAuraStateMask) != 0)
+                    {
+                        m_values.ModifyValue(m_unitData).ModifyValue(m_unitData.AuraState);
+                        ForceUpdateFieldChange();
+                    }
+                }
+            }
 
             aura.HandleAuraSpecificMods(aurApp, caster, false, false);
         }
@@ -4099,7 +4112,17 @@ namespace Game.Entities
             // Update target aura state flag
             AuraStateType aState = aura.GetSpellInfo().GetAuraState();
             if (aState != 0)
-                ModifyAuraState(aState, true);
+            {
+                uint aStateMask = (1u << ((int)aState - 1));
+                // force update so the new caster registers it
+                if (aStateMask.HasAnyFlag((uint)AuraStateType.PerCasterAuraStateMask) && (m_unitData.AuraState & aStateMask) != 0)
+                {
+                    m_values.ModifyValue(m_unitData).ModifyValue(m_unitData.AuraState);
+                    ForceUpdateFieldChange();
+                }
+                else
+                    ModifyAuraState(aState, true);
+            }
 
             if (aurApp.HasRemoveMode())
                 return;

Source/Game/Entities/Unit/Unit.cs

@@ -1626,8 +1626,6 @@ namespace Game.Entities
 
             if (s == DeathState.JustDied)
             {
-                ModifyAuraState(AuraStateType.HealthLess20Percent, false);
-                ModifyAuraState(AuraStateType.HealthLess35Percent, false);
                 // remove aurastates allowing special moves
                 ClearAllReactives();
                 m_Diminishing.Clear();