I have developed a PCB based on your reference designs, including an I2C sensor device.
I have burned the SW to the OTP, and functionally the device appears to operate as expected, waking on a button press and performing a POR. However, a current measurement of the device reports a reading of 110uA, in both extended and deep sleep modes.
I have removed the sensor from the board, and the current usage is still high.
This current reading is taken with a CR2032 cell powering the device, with no debugger etc connected at all - just the bare device, using an accurate DMM.
I can send details of my design if there is a location I can send them direct to.