@takayukister I confirm that I’m using these versions. I just updated Contact Form 7 to 5.5.6, and my WordPress version is 5.9.3. I don’t see how to attach screenshots here, otherwise I would.
I have both WP Fastest Cache (version 1.0.0) and WP Fastest Cache Premium (version 1.6.2) installed, they are updated to their latest version. Both appear to be working fine. I think the issue could be with recaptcha integration