How is the material design Snackbar accessible if someone is using a screen reader?

I have an accessibility question about the snackbar pattern used in Material Design. Snackbars - Material Design

The behaviour of a snackbar is to appear for a temporary period of time then automatically dismiss itself.

To me it doesn’t appear to be accessible for a user who has screen reader turned on as the reader may miss reading out this message.

What are your thoughts?