When tapping the time textbox of the MaterialTimePicker, the clock selection popup appears and quickly disappears, making it impossible for the user to choose the time.
You can test on Android phone, or even in Chrome Dev Tools with device toolbar activated (for ex. Responsive mode with tough screen), directly in the demo here: https://gwtmaterialdesign.github.io/gmd-addins-demo/#timepicker
On laptops/desktops it workes fine.
Also, if you have a workaround idea or something I could try until it is patched, please share.