I was playing Twitch and waiting near the destroyed mid T3 turret for my Q to come off cooldown. In the replay, I have red team fog of war enabled to see what they could see - and somehow they had vision of me even though I was in what should have been fog.

Details:

• I had Oracle Lens (red sweeper) active - no wards revealed
• Enemy team comp: Vayne, Soraka, Briar, Smolder, Sett (no vision-granting abilities like Ashe E)
• Their turrets and inhibitors were already destroyed
• I wasn't near any minion waves that could have spotted me

I've watched the replay multiple times and can't figure out what gave them vision. You can see on the minimap that I'm visible to red team despite being in a dark area.

Anyone know what I'm missing?