Hi Lisa
That’s a great plugin thank you. It appears that I have a few errors with my site. Regarding the Reusable Blocks issue, AMP seems to be the one plugin that when disabled allowed me to see the missing and now available, Reusable Blocks. I will go through the rest of the plugins to be sure.
I also found using the Health Check plugin, that my site failed the Loopback requests which is shown under the critical issues. I have idea how to resolve that.