I started working on an app using the new theme app extensions and noticed some weird behaviour with different templates.
The documentation at https://shopify.dev/apps/online-store/theme-app-extensions/extensions-framework#:~:text=No-,template... states the following:
"The possible values are product, collection, article, and blog."
However, using other templates such as index or page seems to work and Shopify CLI also gives this error if an incorrect template is included:
Invalid tag 'schema': templates: must be one of 404, cart, checkpoint, gift_card, list-collections, password, queue, search, customers/account, customers/activate_account, customers/addresses, customers/login, customers/order, customers/register, customers/reset_password, article, blog, collection, page, product, index
Is there a way to get theme app extensions working on specific custom templates currently, or is this a bug?
I just encountered this as well. This is a pretty big bug that completely breaks the app-block mechanics on custom templates.
Any Shopify employee available to let us know if this is known and being fixed?