I have struggled with several blank Chinese keys thinking they were all bad. Hextag rejecting keys because they are not blank. checked keys with tango and they are blank. So I tried different positions. I notice it accepts keys in weird positions, sometimes on top of the tool. Each key is accepted in a totally different position from the other. Not good!! Lets improve this.
And I also notice keyless type of key has this problem. Normal remote key seems to have no problems most of the time.