Redirect plugin with & # 39; / false & # 39; in URLs returned as 404

I see many 404s registered by the WordPress plugin redirection, e.g. Eg contact-us / false. The user agent that finds the 404s is Googlebot-Image / 1.0

I've connected Search Console to the site and no 404 is reported.

Wondering if these 404 models are a cause for concern and what might cause them?