This bug still exists. I collected Rough Astral Diamonds in the Gateway, checked in-game, and saw that I received them correctly. So I ran some more Tasks, collected the Rough Astral Diamonds in the Gateway, but when I checked in-game later, I had not received them correctly.
I disagree. I believe the current Celestial Coin design only implies that some players can log on once a day for at least a week straight. I also believe you are implicitly overstating the importance of Celestial Coins.