'How to translate a taggit field in Wagtail

I have a Page model, called Activity which has a taggit field called Keywords. I'm using wagtail-localize to allow Activity to be translated. I have configured the localization to synchronise my content from English to other languages, as per the docs.

from wagtail.core.models import Page, TranslatableMixin
from taggit.models import TaggedItemBase

class Keyword(TranslatableMixin, TaggedItemBase):
    content_object = ParentalKey('Activity', on_delete=models.CASCADE, related_name='keyword_items')

class Activity(Page):
    ...
    keywords = ClusterTaggableManager(through=Keyword, blank=True)
    ...

Adding the TranslatbleMixin words for other ForeignKey fields works as the docs say. However doing a "Synchronized translation" in the Wagtail admin page, there is no field to translate or sync translate for Keywords.

Am I missing something.



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