[GAMEPLAY] Elise not taking damage from fountain turret in spider form

I remember there being a patch that specifically addressed the spider-lings being target-able by towers after elise, making her dives less of a free play, but in the most recent game I was in, an elise was able to dive into fountain turret without taking dmage for several seconds. Is this an intended interaction? I would post replay, but I don't record matches.