It's only a surmise but maybe your machine had already been flagged for the update prior to the withdrawal of KB4056892 for affected AMD systems. The exact timing of the withdrawal is not stated.
In my experience its not really a big problem, after three failed boots the update was auto-reverted and my machine was again usable, as before.
Then, I took two actions to suspend it. Firstly I logged in as admin, and changed the Windows Update 'Advanced Options', to pause updates for 35 days. This is only available on 'Pro' or better. I also used 'wushowhide.diagcab',
to remove KB4056892 from the queued update list.
I've not tested it, but folk on 'Home', may find the second option is sufficient on its own.