stacked BarChart shows no edges for big list of data

bc = BarChart[Table[RandomReal[9], {i, 35}, {j, 11}], 
   ChartLayout -> "Stacked", BarSpacing -> None]

enter image description here

Somehow, the rectangles are rendered with the directive

EdgeForm[Directive[Opacity[0.]]

when the input data is larger than some threshold.

You can post-process the output to change Opacity[0.] to Opacity[1.]:

bc /.  Opacity[0.] -> Opacity[1.]

enter image description here

I think @kglr has hit on the core issue of the problem by noting the addition of the Opacity directive once you cross a threshold.

If you want to include the solution in the code, you can specify it with ChartStyle andEdgeForm directly.

BarChart[Table[RandomReal[9], {i, 35}, {j, 11}], 
 ChartLayout -> "Stacked", BarSpacing -> None, 
 ChartStyle -> EdgeForm[{Thin, Opacity[1]}]]

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