Single Post Dynamic Template selection not working?

I created a CPT “Download” and wanted to associate a template I created via the Templatera Template Plugin, also called “Download”.

I am able to select the “Download” template:
“Single Post Dynamic Template
Select a template to be used for your singular post design.”

But when I request the detail page of the CPT it uses the default. I tried a few things w/out success, e.g. associating “Default template for post types” in the WPBakery Page Builder General Settings.

As I use a Theme of the plugin author I have a Theme Settings section in the admin of the plugin. I noticed that when activating
“Post Settings Metabox
Enable the post settings metabox in the editor for this post type.”
that by selecting the option
“Dynamic Template
Select a dynamic templatera template to override this page. If selected it will disable the front-end editor.”
in the Settings section of the CPT Download the dynamic (Templatera) template is used.

tl;dr
Associating a dynamic template for a CPT in the Theme section admin area of the plugin (with an active Total Theme) does not result in the template being used in detail view.