Deleting naps on Garmin Connect doesn't remove them from the watch

Last week I did a 400km bike ride using my Edge 1030, took a nap mid ride for 50 minutes at 1am, I went to sleep proper at 8am when I got home.

Garmin recognised the naps from my 955, but thought the first part of my ‘proper’ sleep was a nap too, but also recorded the actual sleep block as well (so the sleep appears twice). As a result the sleep score showed as 33. I deleted the nap from GC on my iPhone (revising the sleep score to 51) but it didn’t update on the watch chart, so the sleep score chart on the watch is still wrong, the nap still shows and this impacts the TR.

So, how to remove the nap on the watch? It’s impacting the TR, and the sleep history on the watch is still wrong.

Thanks