Table.SelectRows() fails to filter

Using the Google Analytics connector again.

let
    Source = GoogleAnalytics.Accounts(),
    #"Account" = Source{[Id="xxx"]}[Data],
    #"Site" = #"Account"{[Id="yyy"]}[Data],
    #"View" = #"Site"{[Id="zzz"]}[Data],
    #"Added Items" = Cube.Transform(#"View", 
       {
          {Cube.AddAndExpandDimensionColumn, "ga:yearMonth", {"ga:yearMonth"}, {"Month of Year"}}, 
          {Cube.AddMeasureColumn, "Pageviews", "ga:pageviews"},
          {Cube.AddMeasureColumn, "Avg. Time on Page", "ga:avgTimeOnPage"}, 
          {Cube.AddMeasureColumn, "Entrances", "ga:entrances"}, 
          {Cube.AddMeasureColumn, "Unique Pageviews", "ga:uniquePageviews"}
       }
    ),
    #"Filtered Rows" = Table.SelectRows(#"Added Items", each [Month of Year] = "201605"),
    #"Sorted Rows" = Table.Sort(#"Filtered Rows",{{"Unique Pageviews", Order.Descending}, {"Pageviews", Order.Descending}})
in
    #"Sorted Rows"

the resulting table still has a row for every month. Power BI bug I assume?

Interestingly, if I add

          {Cube.AddAndExpandDimensionColumn, "ga:pagePath", {"ga:pagePath"}, {"Page"}}, 

Then the filtering does work. So this is a strange bug.