I am not sure if it's a known issue or not. Facing this issue when I try to change the preview Desktop from another device type(Mobile, Tablet) state value is resetting to default, I have tested other states, but happening the same.
Please note this is happening for Desktop only not for other devices.
Here is the video https://youtu.be/lkMzkKjGGPw
I have also tested by setPreviewDeviceType method and default preview button at the top, the same things happening.
const { __experimentalSetPreviewDeviceType: setPreviewDeviceType,} = wp.data.dispatch('core/edit-post') setPreviewDeviceType(screen);
Environment info WP -6.0 Gutenberg - Chrome Desktop on Windows10