https://siteorigin.danwin.dev/ I’ve just setup a fresh WordPress installation, PHP8.3, WP 6.7.2, with the Plugins: Page Builder by SiteOrigin (2.31.5), Really Simple CAPTCHA (2.4) and SiteOrigin Widgets Bundle (1.67.1)
Then I activated the Contact form widget, created a new site and added the contact form widget. Then under spam protection, I enabled the really simple Captcha integration. When Submitting the form, above errors get logged and captcha fails verification.
The layout export you can find here: https://siteorigin.danwin.dev/siteorigin.json
