[Race concluded, ... but not concluded]

Thanks, I hadn't realised it was a known bug

[Race concluded, ... but not concluded]

I just completed "Le Telegramme"/Tresco. When I arrived at destination, on my mobile phone,  as soon as my boat touched the arrival circle, I got the in-game message saying "Race completed - waiting for approval", or something similar.

At that point my position was in the order of 2000, and I put away my phone without monitoring the race any more. The morning after, the app was telling me that I was still racing, and was aground, with the boat stuck very close to the arrival, but not yet inside the circe. My position at that point had slipped to 6000+. I managed to get the boat sailing again and complete (again) the race.

My question is, why did I get that message  in the first place that told me I had arrived? The bow of the boat was indeed touching the circle, is it enough or shall the whole boat pass the mark?