[2019] Potetial Bug? Oathsworn Knight takes damage from Bonecrusher Giant.

My first question, please don't hate me.

I was drafting just 5 minutes ago. Was playing the Adventure from Boncrusher Giant (2 Damage) on Oathsworn Knight. I thought it would remove a counter but it did not. Lost me the game. Did I make a mistake here? He just had a Flutterfox on the board, too.

Rulings from Wizards regarding Oathsworn: " If damage that can’t be prevented is dealt to Oathsworn Knight, one counter is still removed from it. "

MTGA Tool Action log is saying: Stomp targeted Oath. Stomp dealt damage.

If it's a bug where can i report it?

Edit: I played the Giant, their Oath didn't lose the counter!