Hi @portmeirion
We’re sorry to hear about your experience with the Yoast SEO plugin. You’ve mentioned that the last two updates to the plugin (21.7 and 21.6) makes it impossible to save posts and that it makes mistakes. This isn’t the experience we want our users to have and we’d like for you to be able to use the plugin as expected.
Based on your description of the issue, it’s likely a conflict with another plugin or theme on your setup, so we would recommend that you try to perform a conflict check to identify the conflict.
We are aware of a recent issue with the Gutenberg plugin, so could you please check if deactivating or downgrading that plugin would help resolve the issue?
You can also create a new support forum topic so that we can try and help resolve this issue. Please do include all of the information from the conflict check, such as a screenshot of any visible error messages, so we can fix and address your concern.
Thanks for your feedback and we hope we can provide support and make your experience better.