Core/Vmaps: Fix inconsistency of hitInstance and hitModel to cause wrong area ids

Port From (https://github.com/TrinityCore/TrinityCore/commit/6ce66659929cbd680a91dd5caa1a5957f30b0716)

Source/Game/Collision/Maps/MapTree.cs

@@ -24,6 +24,12 @@ using System.Numerics;
 
 namespace Game.Collision
 {
+    public class GroupLocationInfo
+    {
+        public GroupModel hitModel;
+        public int rootId = -1;
+    }
+
     public class LocationInfo
     {
         public LocationInfo()

Source/Game/Collision/Models/GameObjectModel.cs

@@ -155,7 +155,9 @@ namespace Game.Collision
             Vector3 pModel = iInvRot.Multiply(point - iPos) * iInvScale;
             Vector3 zDirModel = iInvRot.Multiply(new Vector3(0.0f, 0.0f, -1.0f));
             float zDist;
-            if (iModel.GetLocationInfo(pModel, zDirModel, out zDist, info))
+
+            GroupLocationInfo groupInfo = new();
+            if (iModel.GetLocationInfo(pModel, zDirModel, out zDist, groupInfo))
             {
                 Vector3 modelGround = pModel + zDist * zDirModel;
                 float world_Z = (iInvRot.Multiply(modelGround) * iScale + iPos).Z;

Source/Game/Collision/Models/ModelInstance.cs

@@ -194,7 +194,9 @@ namespace Game.Collision
             Vector3 pModel = iInvRot.Multiply(p - iPos) * iInvScale;
             Vector3 zDirModel = iInvRot.Multiply(new Vector3(0.0f, 0.0f, -1.0f));
             float zDist;
-            if (iModel.GetLocationInfo(pModel, zDirModel, out zDist, info))
+
+            GroupLocationInfo groupInfo = new();
+            if (iModel.GetLocationInfo(pModel, zDirModel, out zDist, groupInfo))
             {
                 Vector3 modelGround = pModel + zDist * zDirModel;
                 // Transform back to world space. Note that:
@@ -203,6 +205,8 @@ namespace Game.Collision
                 float world_Z = (iInvRot.Multiply(modelGround * iScale) + iPos).Z;
                 if (info.ground_Z < world_Z) // hm...could it be handled automatically with zDist at intersection?
                 {
+                    info.rootId = groupInfo.rootId;
+                    info.hitModel = groupInfo.hitModel;
                     info.ground_Z = world_Z;
                     info.hitInstance = this;
                     return true;

Source/Game/Collision/Models/WorldModel.cs

@@ -350,7 +350,7 @@ namespace Game.Collision
             return false;
         }
 
-        public bool GetLocationInfo(Vector3 p, Vector3 down, out float dist, LocationInfo info)
+        public bool GetLocationInfo(Vector3 p, Vector3 down, out float dist, GroupLocationInfo info)
         {
             dist = 0f;
             if (groupModels.Empty())