v0.21.12 hotfixes

This update is a small hotfix to solve some issues :)

[h3]Changes:[/h3]
Fixed bosses start health visual bug when fighting multiple people.
Fixed possible bug where some players would not get drops from bosses.
Fixed edge case where summoners would not get loot from bosses.
Fixed rare crash when rendering players.
Fixed baby zombie archer texture not being loaded correctly.
Fixed crash when changing levels.