fix(Core/AI): Fix bosses being stuck IN_PROGRESS if despawnonevade fl… (#19070)

fix(Core/AI): Fix bosses being stuck IN_PROGRESS if despawnonevade flag is used

src/server/game/AI/ScriptedAI/ScriptedCreature.cpp

@@ -650,6 +650,16 @@ void BossAI::_JustEngagedWith()
     }
 }
 
+void BossAI::_EnterEvadeMode(EvadeReason why)
+{
+    CreatureAI::EnterEvadeMode(why);
+    if (instance)
+    {
+        instance->SetBossState(_bossId, NOT_STARTED);
+        instance->SaveToDB();
+    }
+}
+
 void BossAI::TeleportCheaters()
 {
     float x, y, z;