Heroes without inventory in the "WarChasers" map

WarChasers is an ancient map of the game developers. Its essence lies in the passage of the dungeon for various heroes. Along the way, we received artifacts from monsters or bought them at various shops.

Recently, friends and I myself discovered a bug that makes the map 100% impassable - all the heroes do not have inventory (only BladeBerserker). Because of this, the heroes cannot pick up artifacts and books to facilitate passage. The key for opening invulnerable gate falls on the map from the first miniboss, because of the inability to pick it up, the map has become very broken.

Example: imgur. com/a/KMgzAXU

I have a fixed version available here:
https://www.hiveworkshop.com/pastebin/f226f6cf9fdfe5a00262793195a3d228.29895