[Plugin: Redirection] Redirected URLs to 404 Return 200 Response

Note: redirection version: 2.1.25

Hi there
First, what a fantastic plugin! Well, apart from this problem, but I have only noticed it recently. ??

I am attempting to redirect to a 404 error, pages where parameters have been appended to the URL (ie https://www.mysite.com/?img=123) and are being listed in google as duplicate entries (only https://www.mysite.com/ should be listed).

For addresses from my site that do not exist (and have no bogus parameters), the 404.php page from my theme is returned correctly, with a 404 http response.

Without a redirect configured in the redirection plugin, for addresses that do exist but bogus parameters have been appended return the page published page, and the bogus parameters have no effect.

Using redirection, adding a “redirect to 404” rule to match the parameters by regex, the 404.php error page is indeed displayed, but the http response is 200 rather than 404.

Can anyone help me to correct this issue, please?

Thank you very much indeed for your help
Hal