Block editor stops loading custom styles

Hi.

I’m working on a page setup and desing. I put the editor styles support on the functions.php like this:

add_theme_support('editor-styles');
add_editor_style('style-editor.css');

And that’s worked perfect all the time. Untill yesterday, after I updated WordPress to 5.5.1. Then it stops to load the styles and show the predefined ones.

I deactivated every plugin, and even tried on another wordpress install the theme I’m working on (I’m developing it locally), but custom styles didn’t appear.

Anyone have a clue why that happens?

Thanks.