Ability to add new automations to managed templates and publish to existing instances

Description

Having moved all templates to managed templates, we have just discovered that when we add new automations and publish to existing instances, this does not flow through. This is a bit frustrating as we understood the ability to make all changes to existing instances was included in this feature initially.

What are you trying to achieve

to be able to create and publish new automations and publish these to all existing instances.