As far as I understand the linear mode of the horizontal / vertical stepper should disallow advancing to steps that have not yet been completed.
However when presenting an already prefilled form (such as on an edit page) to the user where most of the info is already filled out, I would expect the stepper to allow the user to skip steps which are valid based on the form validations.

Reproduction

https://stackblitz.com/edit/angular-se74ga

Steps to reproduce:

1. Open page
2. (notice that the components in step 1 and step 2 have been autofilled, and reload the page to reset state)
3. Click on the 3rd step, without going to step

Expected Behavior

The stepper should allow switching to step 3. The stepControls in step 1 and 2 are valid

Actual Behavior

It's not.

Environment

• Angular: 9.0.0
• CDK/Material: 9.0.0
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): N/A