Tried to take a look at
Dikson Airport (UODD)
but the city and the airport are missing.
Seems like the Bing satellite data is still pretty bad in that part of the globe.
Is there an “official” way to report those missing airports?
Yes, but you don’t need to, it was already done.
See this thread.
And your post is the correct way, just add a Zendesk request as well so it is in the system.