“”Sorry, the content area was not found in your page”

I have tried the fix suggested on GitHub but still get this error: “Sorry, the content area was not found in your page.” error when I try to edit/add a loop template. I do not get the error with one of the default templates (e.g., Twenty Seventeen).

My current setup is:
Hello Elementor v2.3.0
Elementor v3.0.11
Elementor Pro v3.0.5

I have had this issue since the v3 Elementor upgrade.

The recommended solution is: Find the single / single post / single page template that has All Singular instances and change Display Conditions to Posts all.

I have a created single post template set up with the display condition set to Posts All but I am still unable to create a loop. Prior to that I did not have any that used the All Singular Instances display condition so I had to create one for this purpose. Are there an other possible fixes?

Thanks.

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