1.16.4-1.13.9
Crystal Tools show the "Something seems to be here, but understanding of it is not yet revealed." tooltip when the tool has an undiscovered attribute (e.g. Focus: Horologium before the player has attuned themselves), even when that attribute doesn't affect the tool.

How to reproduce:

• Create a new creative world
• Maximise yourself with /as maximize @s
• Give yourself 3 Celestial Crystals with the attribute "Focus: Horologium" with the command /give @p astralsorcery:celestial_crystal{astralsorcery:{crystalProperties:{attributes:[{discovered:1,pLevel:2,property:"astralsorcery:constellation.horologium"}]}}} 3
  (this will give you 6 crystals due to #1682)
• Craft a Crystal Pickaxe in an altar with the crystals
  -> note that the pick's tooltip is empty
• Reset your AS progress with /as reset @s
  -> note that the tooltip says "Something seems to be here, but understanding of it is not yet revealed."