URGENT BUG: Cannot apply email template to email campaign (3.0b8)

At this point I cannot send emails with a custom template.

I've created a template for a newsletter. When I create a new campaign I have a blank slate with the prompt "Type / to choose block" and my footer.

If I select from the right under Email-Body, Import/Use templates, I can select the appropriate template from My Templates. The window briefly says "Loading Editor" and then reverts back to the blank slate empty block editor.

From the select template dialog I can select the eye icon and preview the template. If I click on either the template name or the Use Template button, I'm returned to the empty block editor.