BQ25638: Charge with Solar Power Source Simulator

Part Number: BQ25638
Hello ti team,
     We found out when we were doing Charge with Solar Power Source Simulator testing。
At 4.1V, the Vbus input 10-30mA current, BQ25638 to charge the battery current is 0mA, this phenomenon also appears in EVM。
I would like to know why bq25638 cannot be charged at 10-30mA if the following conditions are met?Attached is our test report。
1 VBUS > VBAT + VSLEEPZ
2 VVBUS < VVBUS_OVP
3 EN_HIZ = 0
4 VSYS < VSYS_OVP
5 TJ < TSHUT