Hi team, I was speaking with my account rep on an issue with Blueprints and we identified that when creating a Blueprint from a task, it will save any custom fields existing before the BP was created. This is good, because I thought it didn't, so I was creating templates as regular tasks (because I needed this custom field functionality).
However the issue we identified is that once it's a Blueprint, you can't edit the fields, and you can't see any fields, this is why I was confused. So good news, but also bad news, because if I have to make a change to the custom field in future, I have to recreate the Blueprint as a regular task, edit it, then resave as a Blueprint, then reconnect it in any forms it is being used (tedious).
If a Blueprint has custom fields you should be able to see it and edit it in the task view.