I have a custom taxonomy ‘Digital Series’ (digital_series) - note the use of the underscore.
When creating templates, this works:
As is expected by the WordPress template hierarchy.
This does not:
An easy fix is to use hyphens instead of underscores when registering the taxonomy, but it can be a pain when you have a live website that already uses the underscore naming convention.
I have a github issue open about it: https://github.com/roots/sage/issues/2447