Bricks Version: 1.7 Beta
URL: Video of me recreating the bug: Bricks Builder 1.7 Beta Template Bug
Installed 1.7 Beta after encountering lag in 1.6.2 Editor (for me it was mostly in the Typography tab).
Created a simple Single page Template which worked fine, then created a Header Template and encountered a problem of it not displaying in the editor. Tried again with a Footer Template with the same issue. Originally this happened in Chrome. I switched to Vivaldi but had the same issue.
I deleted everything and re-installed a clean WP Site and added Bricks Builder 1.7beta and OxyProps. I had the same issue. I deleted 1.7beta and re-installed 1.6.2, the Templates displayed in Editor correctly ready to be worked on.
I deleted all Templates, re-installed 1.7beta to see if I could recreate the issue once more for the video. As you can see the Single, Pop-up, Section and Header Templates once again failed to load in the Editor (although it did look like the Header template was going to work for a moment).
I then switch over to Chrome, log in and open each template again, with the same outcome. Once I deleted and reverted back to 1.6.2, all templates load as expected.