We apologize for any inconvenience caused.
In the Steam® version, we have confirmed the phenomenon where a badge (◆ symbol) appears on the + button of the Lodestar Gems in the upper right corner of the home screen when the in-game date refreshes, even though no new contents have been added.
The badge can be removed by tapping the + button on the Lodestar Gems and moving to the Purchase Lodestar Gems screen, but the badge will appear again when the next noon (date refresh) arrives.
We are currently investigating and addressing this issue. When we have any further information to provide regarding this matter, we will make announcement through the in-game "Announcements".