Pulse Ox weekly view not updating

I’ve worn my Epix 2 for the better part of a month now and noticed that the weekly view of the Pulse Ox readings in the Glances list only ever fills in on the left side of the timescale (see photo),

it never shows a full week. The daily view is fine. Is anyone else seeing this? Pulse Ox is always on, and firmware is the latest (7.24).

If I toggle the setting (Pulse Ox Sensor to “Manual Check” and then back to “All Day”) that the graph then updates for around 24 hours, before again stopping to update.

The daily graph on the watch is filled in completely, so there are no gaps in recording.

The monthly and weekly graphs on Garmin Connect Mobile are also filled in, so obviously the data is being collected, stored and sent to GCM. It would seem that the weekly view graph on the watch simply fails to be updated.