ClosedGTmetrix, and Pingdoms show many request 404.html and increase load time

CyberPanel V2.3.1

In cyberpanel I crated domain , with auto installation of WordPress and then restart the server , I saw in Gtmetrix there are lots of request for 404.html .
Why?
In subdomain , even new domain , there result was the same…

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watching mode

Please check (using the + button on the waterfall) the 404 file and see which file is getting this 404 error. Try to open that file in the browser to verify. Check the file path specifically.

I can see there is a 302 redirection happening with this particular file which ends in 404 error at final attempt.

PM me the domain name and I will have a check.