Possible issue accessing font-library.php

When I try to access ../wp-admin/font-library.php, I get this error message in the browser console (firefox):
Uncaught (in promise) TypeError: Lidentificatore @wordpress/boot un identificatore bare, ma non stata rieseguita la mappatura verso alcun modulo. Gli identificatori modulo relativi devono iniziare con ./, ../ o /. font-library.php

Unfortunately, my version of Firefox is in Italian, but I hope this report will be helpful to you. Obviously, if I disable your plugin, the error disappears and font-library.php becomes accessible.

Best regards