New and clean package straight from the factory and a shapeless blob vaguely resembling Texas Instruments logo. This is 100% guaranteed Chinese fake.
See my own collection of fake opamps from AliExpress
https://www.eevblog.com/forum/projects/whats-inside-the-cheapest-and-fakest-jellybean-opamps/When I grounded pin 3 on a working 741, after removing the x2 100k resistors , supplying 20V, I got 18.20V at both pin 6
As long as there is connection from pin 6 to pin 2 it shouldn't be doing this, the output should be about 2V. It doesn't even matter if pin 3 is grounded or completely disconnected, it should be 2V.
In reply #5 in my thread I have shown how they wire the left half of a dual opamp to work like a single opamp. I suspect that your "good" chips are this exact thing. There is an easy test: DMM in resistance mode, black probe on pin 4 (ground), red on pin 1 or pin 5 (offset adjustment). Real 741 has about 1kΩ in both cases. (My sample measures: 1250, 1300). Fake chips will show open circuit.
As for the bad ones, there is a chance that they are
dual opamps with fake markings. Apply power to pin 8 instead of pin 7 and test them again, taking output from pin 1 instead of pin 6. So connect pin 1 to pin 2, connect pin 3 to the resistors, see what's on pin 1.