When I attempt to use or sense, the UI (minus my items for some reason), vanishes for a period of time, and the ores are never actually highlighted at all, even when it says the pokemon I'm using can sense ores nearby.

*even though it DOES, which is shows in chat when the UI comes back. The message has always shown up when i've tried.

Hey there,

I've confirmed the issue and forwarded it to our internal tracker.
Thanks for the report!

Ore sense still broken as of 9.0.4
Doesn't reveal any ore, but it highlighted lapis two blocks above its actual location.

I wanted to add some details to this as I was trying to use it recently. Ore sense does detect the following.
In the overworld: Coal, Iron, Gold, diamond, Redstone, and Lapis Lazuli, (and possibly emerald)

It does not detect any of the following in the overworld. Bauxite, Copper, silver, platinum, silicon, ruby, amethyst, sapphire, crystal, thunder stone, leaf stone, fire stone, water stone, dusk stone, dawn stone, or shiny stone.

It does not detect any of the following in the nether: nether gold, ancient debris, or quartz.

I forgot to add that moon stone, sun stone, and ice stone are also not affected by ore sense.