Hi,
I have created a feature class with symbology defined by a custom Arcade expression and applied the following symbology:

However, when I go to create a template of this symbology using Manage Templates --> New --> Templates for Layer it only generates the first symbol in the list:

If I select a single feature and try to generate the a single template from that feature using Template from Feature... it uses the same symbol regardless of the feature you select:

Any help appreciated.
I'm using ArcGIS Pro 2.4.1.
Thanks,
Zak