Pin 8 in Wemos D1

I have got my WeMos D1 and within an hour it was working as a PIR detector with my home control server.
Something strange with pin 8 which is connected to a led:

Code:

  Private pin8, pin7, pin6 As Pin
Private D1 As D1Pins
End Sub

Private Sub AppStart
   Serial1.Initialize(115200)
Log("AppStart")
   pin6.Initialize(D1.D6, pin6.MODE_INPUT_PULLUP)
   pin7.Initialize(D1.D7 ,pin7.MODE_OUTPUT)
   pin8.Initialize("D8" ,pin8.MODE_OUTPUT)
   pin6.AddListener("PIR_StateChanged")...  

Pin 8 in Wemos D1

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