Issue description
Animated textures, for custom models and normal blocks, don't work anymore. Any animated texture shows up as a missing texture in game. The method I used (making the texture every frame of animation stacked on top of each other) worked in previous versions but doesn't now.
You can't only import animated strip, it needs metadata too.
Open MCreator's animation editor, import your strip there, set animation speed and import it in the workspace from there.