[Resolved] Age taxonomies not showing in product filters on translated page

Background of the issue:
I have a site using WooCommerce and WPML. I want to display 'age' taxonomies as a list in the product filters of my shop on the translated side of the site (Welsh).

Symptoms:
The 'age' taxonomies are not showing in the product filters on the translated (Welsh) page, although they display correctly in English.

Questions:
Why aren't the 'age' taxonomies displaying on the translated (Welsh) page?
How can I ensure that taxonomies appear correctly in product filters on translated pages?