XIAO Expansion Board trouble

XEB was working normally for about 10 minutes after I started using it. However, suddenly the green LED of XIAO went out and it stopped working. Only power is supplied from USB, and no battery or peripherals are connected. The current consumption of XIAO alone is 15mA, but when it is attached to XEB, the current consumption becomes 285mA and the green LED goes out. I think it’s a component failure.

On the other hand, looking at the circuit diagram of XEB, the 3.3V output pin12 (SYS_3V3) regulated inside XIAO and the 3.3V output (SYS_3V3) of the regulator ETA3410 of XEB are connected. Isn’t there a problem with the design that the outputs are connected to each other?