Datepicker: When selecting a month in a year/month mode, the day selection flashes on click

#### Reproduction

https://stackblitz.com/angular/kgvngvkblme?file=src%2Fapp%2Fdatepicker-views-selection-example.ts

Steps to reproduce:
1. Click on the calendar icon
2. Select a year
3. Select a month

This is actually the example from https://material.angular.io/components/datepicker/overview, although I found it more noticeable in my app

#### Expected Behavior

The datepicker calendar should close immediately.

#### Actual Behavior

When clicked on the month, the calendar briefly switches into monthly view (therefore displaying all the weeks and days), before closing.

#### Environment

- Angular: 10.2.0
- CDK/Material: 10.2.5
- Browser(s): Chrome
- Operating System (e.g. Windows, macOS, Ubuntu): macOS

Start with the StackBlitz reproduction, especially src/app/datepicker-views-selection-example.ts, and reproduce the year-then-month selection in the Angular datepicker. Trace the transition after month selection and verify that the calendar closes immediately without briefly showing the day view.

Written by the indexing model from the issue text.