Don't remove metatable in adapter to make re-registering more stable

Author: ark120202

game/scripts/vscripts/lib/dota_ts_adapter.ts

@@ -109,10 +109,6 @@ function clearTable(table: object) {
     for (const key in table) {
         delete (table as any)[key];
     }
-
-    // Remove metatable added by ExtendInstance
-    // https://github.com/SteamDatabase/GameTracking-Dota2/blob/7edcaa294bdcf493df0846f8bbcd4d47a5c3bd57/game/core/scripts/vscripts/init.lua#L195
-    setmetatable(table, undefined);
 }
 
 function getFileScope(): [any, string] {
@@ -131,7 +127,9 @@ function toDotaClassInstance(instance: any, table: new () => any) {
     let { prototype } = table;
     while (prototype) {
         for (const key in prototype) {
-            if (instance[key] == null) {
+            // Using hasOwnProperty to ignore methods from metatable added by ExtendInstance
+            // https://github.com/SteamDatabase/GameTracking-Dota2/blob/7edcaa294bdcf493df0846f8bbcd4d47a5c3bd57/game/core/scripts/vscripts/init.lua#L195
+            if (!instance.hasOwnProperty(key)) {
                 instance[key] = prototype[key];
             }
         }