Block plugins URL was causing the issue as the file was called from inside a css file.
Plugin Author
Maya
(@tdgu)
Hi,
Some of the assets (e.g. font files) are included in the stylesheet files through relative/absolute URLs. But if you customize the URLs through the WP Hide AND also block the default, those URLs will not be accessible anymore.
As you already figured, in such a case you should not block the default URLs.
As an alternative, the PRO includes a postprocessing functionality that will process all site assets and update the URL accordingly to the options https://www.wp-hide.com/documentation/general-javascript-combine/
Thanks