Load block-based template via plugin as a fallback

load template (Site Editor) from the plugin for a post type, if the block theme

I recommend asking at that the plugin support OR the block theme support
so its developers and support community can help you with this.

I wanted to ask this question at Github for Gutenberg but when opening a new issue, it says: “Technical help request: For more technical help requests, create a new topic in the Developing with WordPress Forum”, and provides the following link: https://www.ads-software.com/support/forum/wp-advanced/

Does your question pertain to Gutenberg plugin?

If so, I recommend asking at https://www.ads-software.com/support/plugin/gutenberg/

Awesome! Thank you for your help ??