Core/WorldObject: Properly initialize position data for all types when initially creating them. Fixes some issues with PvP objectives not having the correct area ID set on initialization. Closes #20028.

(cherry picked from commit 28b3469e89)

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

@@ -1037,6 +1037,7 @@ bool Creature::Create(ObjectGuid::LowType guidlow, Map* map, uint32 entry, float
         TC_LOG_ERROR("entities.unit", "Creature::Create(): given coordinates for creature (guidlow " UI64FMTD ", entry %d) are not valid (X: %f, Y: %f, Z: %f, O: %f)", guidlow, entry, x, y, z, ang);
         return false;
     }
+    UpdatePositionData();
 
     // Allow players to see those units while dead, do it here (mayby altered by addon auras)
     if (cinfo->type_flags & CREATURE_TYPE_FLAG_GHOST_VISIBLE)

src/server/game/Entities/GameObject/GameObject.cpp

@@ -258,6 +258,8 @@ bool GameObject::Create(uint32 entry, Map* map, Position const& pos, QuaternionD
         return false;
     }
 
+    UpdatePositionData();
+
     SetZoneScript();
     if (m_zoneScript)
     {

src/server/game/Entities/Player/Player.cpp

@@ -446,6 +446,7 @@ bool Player::Create(ObjectGuid::LowType guidlow, WorldPackets::Character::Charac
     }
 
     SetMap(sMapMgr->CreateMap(info->mapId, this));
+    UpdatePositionData();
 
     uint8 powertype = cEntry->DisplayPower;
 
@@ -18283,6 +18284,7 @@ bool Player::LoadFromDB(ObjectGuid guid, CharacterDatabaseQueryHolder* holder)
     }
 
     SetMap(map);
+    UpdatePositionData();
 
     // now that map position is determined, check instance validity
     if (!CheckInstanceValidity(true) && !IsInstanceLoginGameMasterException())