fix(Core/Creatures): Properly reset encounter if boss despawns on evade. (#11251)

Fixes #8167

src/server/game/AI/CreatureAI.cpp

@@ -219,6 +219,12 @@ void CreatureAI::EnterEvadeMode()
         }
     }
 
+    Reset();
+    if (me->IsVehicle()) // use the same sequence of addtoworld, aireset may remove all summons!
+    {
+        me->GetVehicleKit()->Reset(true);
+    }
+
     // despawn bosses at reset - only verified tbc/woltk bosses with this reset type - add bosses in last line respectively (dungeon/raid) and increase array limit
     CreatureTemplate const* cInfo = sObjectMgr->GetCreatureTemplate(me->GetEntry());
     if (cInfo && cInfo->HasFlagsExtra(CREATURE_FLAG_EXTRA_HARD_RESET))
@@ -226,14 +232,6 @@ void CreatureAI::EnterEvadeMode()
         me->DespawnOnEvade();
         me->m_Events.AddEvent(new PhasedRespawn(*me), me->m_Events.CalculateTime(20000));
     }
-    else // bosses will run back to the spawnpoint at reset
-    {
-        Reset();
-        if (me->IsVehicle()) // use the same sequence of addtoworld, aireset may remove all summons!
-        {
-            me->GetVehicleKit()->Reset(true);
-        }
-    }
 }
 
 /*void CreatureAI::AttackedBy(Unit* attacker)

src/server/game/Entities/Creature/Creature.cpp

@@ -2012,18 +2012,6 @@ void Creature::DespawnOnEvade()
 {
     SetVisible(false);
     AI()->SummonedCreatureDespawnAll();
-    RemoveEvadeAuras();
-
-    float x, y, z, o;
-    GetRespawnPosition(x, y, z, &o);
-    SetHomePosition(x, y, z, o);
-    SetPosition(x, y, z, o);
-
-    if (IsFalling())
-    {
-        RemoveUnitMovementFlag(MOVEMENTFLAG_FALLING);
-    }
-    StopMoving();
 }
 
 void Creature::RespawnOnEvade()