From the official fix list
Pearl Abyss lists the following fixes:
- Fixed an issue where Grimnir would not appear in certain situations while progressing through the quest "The Mysterious Pot."
- Fixed an issue where icons for newly discovered objects in certain regions would not appear on the map.
- Fixed an issue where progression in the "Ether Rest" Abyss was blocked because the power core would not be detected.
This rundown covers listed fixes. Read the official notes for the complete change list and platform rollout details. A listed fix does not establish that a player’s issue is resolved.