Not A Bug Knock Off transfers Sticky Barb on hit

That's how Sticky Barb works with contact moves like Knock Off, when the opponent doesn't have an item.
 
What type of bug are you reporting? Ladder

What is the bug?
On turn 2, a Clefable presses knock off on AV hatterene and transfers its sticky barb to hatterene
Replay below https://replay.pokemonshowdown.com/gen9ou-2125617044-c9oyt9mfmt4ukpl2jokycov4i5hgg8lpw

Are you able to replicate it? If so, how?
Yes
https://replay.pokemonshowdown.com/gen9ou-2125633983-gnxckzfhlamivxgap4gqurl16wc1435pw
They used nuzzle when they didnt have an item


KLAY FOR 3 (brick) used Knock Off!
(The opposing Hatterene lost 16% of its health!)
KLAY FOR 3 (brick) knocked off the opposing Hatterene's Assault Vest!

Here you removed their item


The opposing Hatterene used Nuzzle!
(KLAY FOR 3 (brick) lost 4% of its health!)
KLAY FOR 3 (brick) is paralyzed! It may be unable to move!


here they went for a contact move
 
Back
Top