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SN74CB3T3257: Switch high voltage drop

Part Number: SN74CB3T3257

Is SN74CB3T3257PWR a fully bi-directional switch?

Is the switch electrical behavior identical on both directions, A ports to B ports and B ports to A ports? 

I am asking this because I performed the following test:

I placed 3V supply at pin 1A and 300ohm resistor to GND at pin 1B1 and I measured the voltage drop from 1A to 1B1, the result was 100mV

I placed 3V supply at pin 2B1 and 300ohm resistor to GND at pin 2A and I measured the voltage drop from 2B1 to 2A, the result was 1.2V

Note: I am using SN74CB3T3257PWR with Vcc=3.3V and OE=0V

Can you please explain the reason for the high voltage drop from pin 2B1 to pin 2A?

Thanks in advance