The USB device gets disconnected successfully:
[   70.483616] usb 4-2: USB disconnect, device number 2

If you know how to hack the kernel, this is what I'll try in USB/xHCI code:
- Put the USB link to U3 before disconnecting
- Ensure remote wakeup is disabled before disconnecting

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https://bugs.launchpad.net/bugs/1937350

Title:
  USB HDD not properly spin down after safely remove

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