I guess you did not disconnect R6....if so it surely shifts the node voltage down as it draws a lot of current.Edit:
Tested it by 193kohm in place of diodes and 270kohm resistor to ground and it gave only 0.71V to pin3..
even though in example schematic the pullup were connected to regulated 3V so different place than the sensing VCC.Connect a pull-up resistor from OUT to any supply voltage up to 6V
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