Compatibility with block editor, emails not sent

In August of 2020, I had a communication with 99 Robots, previous developer of this plugin, noting that in my own testing and in the testing done by WP Engine, we could not get the plugin to send notifications when the post was created and published in the block editor (perhaps because of the two-step publishing process). I wrote to the same email address, [email protected], to inquire if there has been any progress on this and have not heard back. I use a valid email sender, WP Mail Smtp, and the test messages work. Also those posts that are created and published in classic editor will send, but WP Mail Smtp is not tracking the opens and clicks, possible a related problem with Post Status Notifications plugin.

There are a number of posts in this forum about notifications not being received that have been closed without an answer. Is it because the plugin is still not compatible with block editor?

I have used this plugin for years and it is simple, lightweight–useful when not wanting to use a much more complicated membership system. It would be nice if you could make it compatible with the block editor.

The page I need help with: [log in to see the link]