Can overcharge condition be released when HY2111 series are in overcharge protection mode and the charger is still connected?

No, the overcharge status will not be released when a charger is still being connected after overcharge detection, even the battery voltage camo is below than overcharge release voltage (VCR). The overcharge status is released when the CS pin voltage goes over the charge overcurrent detection voltage (VCIP) by removing the charger.