Templated email with {% extends parent_name %} doesn't re-resolve the base template

[Andrew]

In django templating you can use {% extends parent_name %} to indicate that the template is derived from another. We use this feature along with django-templated-email to have different base email templates for white-label purposes.

The issue appears to be that {% extends parent_name %} does not get re-evaluated when the variable changes, eg. from email/app1.email to email/app2.email.

• The Engine uses django.template.loaders.cached.Loader
• The first time the template is loaded, the parent template is loaded based on parent_name is loaded
• Subsequent emails load the template, but do not re-evaluate the extends

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If this is as-designed, how would one go about clearing out that cache? When setting up my test case I call the code below, but it doesn't appear to clear the cache, even though my print() debugging shows its the same object (<django.template.loaders.cached.Loader object at 0x113e99828>_

for template in engines.all():
        for loader in template.engine.template_loaders:
            loader.reset()