I am running Arena on a Mac. My opponent has a Bitter Work in play. They activated its exhaust ability to earthbend 4. They then attack with the land triggering the draw a card ability of Bitter Work. In response to the draw a card ability, I cast a The Unagi of Kyoshi Island. Their draw a card ability then resolves resulting in their second card of the turn being drawn. However, my The Unagi of Kyoshi Island didn't trigger and I did not draw two cards.