Taptic Time

I use Taptic Time a lot at night, when I'm too tired to open my eyes but want a rough idea of the time. A two-finger tap and hold on the watch face is enough to give this haptic version of the time.

But there seems to be a fault in Watch OS 7 which stops Taptic Time working in Sleep mode. Two-finger tap and hold does nothing.

I like other features of Sleep in the new Watch OS, but not enough to give up Taptic Time - which is in fact very useful when waking at night. Please can this fault be remedied, or this oversight restored?