I have an issue with the stepper (MDB 5 2.0.0). I want to make it both vertical and linear, but in such case when i try to proceed without filling the necessary data all the steps that are not allowed just disappear. Code is taken from the docs.

Expected behavior
Vertical linear stepper behaving similarly to the horizontal linear stepper (forbidden steps stay displayed but disabled when trying to go to next step if not all data is filled).

Actual behavior
Vertical stepper forbidden steps disappear when a user tries to proceed without filling the needed information.

Resources (screenshots, code snippets etc.)
Before clicking in step2

After clicking step2. Green below is the end of the page.