Strange Header response 404 – GET /none!important?id=

Hello everyone!

I just found a strange Header response returning a 404 but the page actually shows up fine with the exception of a big-time delay for its initial loading!

When I am using the inspect element on Chrome, there is an error notice on the Console tab.

It’s trying to GET!important?id= and this happens on all my pages!

Of course, there will be an error because there is no such page as!important?id=

I have searched all over the web but didn’t find anything related.
Does anyone have a clue what this is and how can I troubleshoot & fix this?

I am running the latest version of WP, PHP is 7.3.25 and all my plugins are up to date.

Any help on this will be greatly appreciated!

Many Thanks.

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