I've been actively COVETing Lunatone and Clefairies for Moon Stones (each have 5% chance held) and Solrock for Sun Stones (5% chance held). Each of these pokemon are found wild in "The End". My pokemon of choice for Covet has been a Teddiursa (holding no items and inventory not full) with a Pickup ability. After about 300 or so Covets with no rewards I've began to wonder if I'm really unlucky, or could there be a bug. So I then went and found some wild pokemon with 100% chance held items and the result is the same. Covet is not stealing anything.

I just tested this further with an Alolan Meowth using Thief. I never received held items from any wild pokemon, even pokemon that say have a 100% chance to hold an item.

Can you provide more info on what else you tried thieving/coveting for? At least for the lunatone and clefairy, I believe they're bugged this not update and not holding their items at a 5% chance for a similar reason as to why the applin, and sinistea arent holding their items.

As previously mentioned I was target farming Solrocks as well. While in "The End" I was just Covet/Thief killing everything I came across though. So numerous Absols, Elgyems, Gothitas, Bronzors, and Miniors were all stolen from and never any item received.

The 100% held chance pokemon I coveted/thiefed from was Miltanks, and still no rewards.

I just managed to Thief a pair of Black Glasses off a Krookodile, if that helps.

ah if the krokodile one is working it should be fine. Pretty sure most of the stuff that you failed to thief fall under the category of the item unable to be equipped in the held item stuff, which is a bug in the code atm where the pokes that have held items that cant be equipped in that slot don't actually spawn with it. The held items should be fixed for whenever next update is though.

It's exactly as you said it. I did some more thiefing and could only thief actual held items. If the item isn't actually a held item like Moon Stones, then it can't be thiefed. Is the pokemon doing the thiefing supposed to equip it after it steals? Seems like it could just be added to inventory after battle the way the Pickup ability adds items.

Nah it’s more the fact that in this update pokes with non hold able held items don’t actually spawn with them. So for example, even if you set clefairy held item chance to 100%, it won’t have its held item. It’s not really a bug with thief/covet.

Oh yeah, that's certainly the case. So do we know if this applies too all pokemon holding non holdables, or only a select few? And most importantly, has this proper ticket been submitted to get this on the internal tracker?

oh late but, not really sure of the exact ticket. But its definitely fixed for the upcoming version. RN it should be that all pokemon with non holdables are under this bug where they wont have their held item