At the end of group rides / races, I noticed that sometimes the power icon isn’t listed on the end of ride summary leaderboard. But the power icon is shown on other widgets such as the sprint leaderboard and the nearby riders.
There was one occasion where the power icon didn’t show up on the summary leaderboard initially. Instead of clicking OK which closes the summary page, I clicked to review the summary. After a while, the power icon eventually showed up for my entry.