CF 5.7.1 conflict with “Invisible reCaptcha” plugin

Problem
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We found that CF 5.4 caused the page to refresh after submission, so downgraded to 5.3.2. Decided to try again with 5.4.1.

I noticed odd anchor tags like #wpcf7-f123-o1 in the URL, as described here:

https://contactform7.com/faq/after-submission-my-contact-form-redirects/

That page leads to this helpful article:

https://contactform7.com/why-isnt-my-ajax-contact-form-working-correctly/

My theme has the proper wp_head() and wp_footer() calls, so I decided to watch the Firefox debugging Console during form submission. I saw some reCaptcha traffic.

I had been suing the “Invisible reCaptcha” plugin to handle all reCaptcha on my site (site logons, registration, comments, and contact forms). Unfortunately that plugin hasn’t been updated in over a year and “may not be compatible with your version of WordPress.”

Solution
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Deactivate Invisible reCaptcha for contact forms (at least). Set up Contact Form 7’s built-in reCaptcha feature (had to get a v3 key as I had been using v2). After that, form submission works properly, displaying the message using Ajax and without refreshing the page.