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BQ25120: bq25120 strange state

Part Number: BQ25120

When our lithium battery is completely out of power (because the voltage is lower than 3.0V, the battery protection circuit will disconnect the battery), we will recharge the battery, but after the battery is charged, bq25120
Will enter a very strange state, no output, but after the external power supply is re-connected, the output is normal. Then remove the external power supply and there will be no output.
Only when the battery is removed and connected, everything is back to normal.

Why is that?

In addition, as long as the lithium battery is not completely powered off, the function is still normal.