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I just had a game against a team with Twitch and Evelynn, so I bought and consumed an Oracle's Extract, expecting it to work the way Oracle's Elixir does on SR. However, despite clearly having a glowing eye over my champ, both eve and twitch still became invisible and untargetable. I was expecting to see them go semi-transparent when they stealthed, but they disappeared entirely as the normally would.
This happened repeatedly out in the open, it was not a line-of-sight/bushes issue or an issue with me dying and thinking I still had the benefit. It just wasn't working.