Lap Swim Rest Screen - Interval Distance

When setting up my watch I reviewed the Pool Swim screens and thought the Rest Screen looked correct for my use (and believe it was default and the same as my 935?).

During swimming, however, the Interval Distance field shown on the rest screen shows as blank (three dashes) rather than providing the distance of the recently completed interval (which is what I want).

At first I assumed there could be a “last interval distance” I could use instead, but I don’t see much in the distance fields here…

Is this a bug?  Am I missing something here?  Assuming this is operating different than 935 / 945 devices it sure feels like a weird thing to break across assumed common code?