Yes! One of the users has posted a video on the Twitter showing that the phone can be unlocked with a printed photo of the face of the owner. The Video was posted and he captioned it as "I printed my face to unlock my OnePlus 6 for the lulz... it worked".
I printed my face to unlock my OnePlus 6 for the lulz... it worked ¯\_(ツ)_/¯ pic.twitter.com/rAVMq8JKBr— rik (@rikvduijn) May 29, 2018
Things get even worse as the Face Unlock feature works even with a Black and White printed face. Some users on Reddit claimed this is developed by a Chinese tech called SenseTime and it is not as good as iPhone X. So, kindly rely on the fingerprint sensor which is at the back or some pattern lock. The phone can be purchased from Amazon India and official OnePlus stores at Rs 44,999.