Same problem on Ticwatch E.
Email notifications do not display or vibrate.
Others work ok.

On Huawei mate 9. Android 7.0

My watch will not vibrate or auto display email notifications from my android Gmail app or 3rd party email app Maildroid. If I flick up, the notifications are there. But I wouldn't know otherwise. Other ones like text, WhatsApp and calls vibrate watch and auto display. Watch and phone are not in no ...

Something has changed.
I still get notifications on watch. They arrive but are not displayed or vibrate.
If i swipe up they are there to read. But I have no way of knowing they have arrived.
Restarted watch and phone etc.
At a loss.