Video proof of being Harvested. Related Forum post - https://forums.warframe.com/index.php?/topic/164975-ever-wonder-what-happens-if-you-lose-to-harvester/
How I did it: - Did enough Invasion missions on the Grineer side in order to get Harvester to spawn. Got an inbox message from Alad V. -Went to a defense map. Waited in Solo. Didn't start it or anything to ensure Zanuka wouldn't kill the objective. -Died and lost my chance at a Detron part :/ -This.
Here's legit proof of it happening. It's not a myth.