Spine animation - black squares

Hello everyone Making a game. We use Spine animation for various objects in the game.
We used to run version 2.0.9, everything was fine. Now we have switched to version 2.3.2, and there is a problem-in FireFox, instead of most animations, just black squares.

The problem is observed exclusively in FireFox browser, as well as when viewing through an IFrame or link, but not necessarily on localhost.

When viewed via localhost, everything is fine. The settings of the spine are standard, the objects are made the same, but some of the objects are displayed, some in black squares.

I really need help in this matter, everything that can be tried, the problem does not disappear.
Previously, adding the debug parameter to the build settings saved everything, but now it doesn’t help either.

In-app screenshots, test link, and test project

Link to ElementGames with IFrame
Link to ElementGames

Test project for download - yandex.disk