nRF Connect for vscode, Flash & Erase and flash actions do not work

The  "Flash" and "Erase and flash" actions wer working fine a few days ago,now it only execute "west build".

I pressed "Flash" or "Erase and flash", it just executed "west build", did not executed "west flash".

But I can run "west flash" well in terminal, and the flash function works fine.

"Flash" and "Erase and flash" has the same phenomenon, "Debug" can execute "west flash".

I tried to restart the computer and update the SDK to the latest, but it did not work. 

os: Windows 10 10.0.19004

board: nrf52840dk_nrf52840

SDK: v1.9.1

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