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@Gordon
Ok, thanks - that's very strange indeed. The gaps could well be due to what I mentioned above about Gadgetbridge getting stopped from running in the background of your phone though.
In the Health app -> Settings, do you have 'HRM Interval' set to 'off'? If so, please could you change it to
10 Min. Without this you probably wouldn't see reliable heart rate data.There are two 'modes' for heart rate reporting in Gadgetbridge... In the normal mode (if you're just connected via Gadgetbridge) the health data is sent every 10 minutes based on the latest and most 'confident' heart rate reading in the last 10 minutes - this is the data that is stored in the Health app, but if the heart rate monitor hasn't been enabled in the Health app then you won't see the heart rate data (unless some other app is using the heart rate).
But in the other mode (where you enable realtime data from Gadgetbridge momentarily by going to the 'Activity and Sleep' page and scrolling to 'Live Activity') the heart rate monitor turns on all the time and the absolute latest HRM data is reported to Gadgetbridge every few seconds even if the watch isn't confident that it is correct.
So if you'd gone to 'Live Activity' from Gadgetbridge on your phone then you might well have seen some inaccurate HRM data (and Gadgetbridge would then store that data I believe), but that seems a bit unlikely.