The user on whose account the problem was detected: HardStone
Coordinates: 389:119:X and some others Planets of shadow alliance
This case a PPS - saw after a friend from other alliance shared a flight for me.
Before this was not in galaxy view and not in flight list.
Date or time of the incident (according to server time): differents.
Description: Some Planets from Players of Shadow Alliance I can not attack.
Because they are hidden.
Why only shadow alliance can hide planets ?
Actions required to repeat the problem: Stop supporting this guys!
Screenshot: https://prnt.sc/24tmdwg