BQ27Z855EVM: ACOV Release Fail issue

Part Number: BQ27Z855EVM

Hi TI team,

I used BQ27Z855EVM to verify ACOV and release, but seems it release fail.

Below is the test log.

1. Supply cell voltage to 3800mV,the EVM is working normal, both CHG and DSG=1, also Pack voltage = 3800mV
2. Set Cell Voltage = 4575mV to trig ACOV, CHG=0, DSG=1, Pack Voltage is about 4200mV, less a CFET diode drop than Cell Voltage. But it shows COV, I think it should be ACOV?
3. Set Cell Voltage to 3800mV,  XCHG and COV=0, but CHG still = 0, Pack voltage less than Cell a diode drop means CFET is OFF. Why it can not released when Cell set back to normal? Thank you for your attention to this issue