Upfront Builder Post Parts - Post Tags not displaying

I know that future development of Upfront Builder had ended, but I am using it to edit a custom theme and I need to add Post Tags to some Posts that are embedded through Upfront using a Post List.

When I add the Post Part, I can see it in the preview, but it isn't being exported (or something is blocking it) to the live site when I save it. I have checked to see if the container is being added to the HTML of the site, and it is not.

I have tried the following to no avail:
*Adding a new Post List
*Adding a new Page Template and inserting a new Post List
*Adding Post Tags to another existing Page Template's Post List
*Emptying the Hummingbird cache with every change and every attempt at fixing it.

Because of this, I'm guessing that there is something blocking it from being generated, I just have no idea what would be causing this.

Screenshots have been attached and labeled to show the preview in Builder, the live website, and the code showing that the container for the tags doesn't exist on the live site.