Graphviz chart comes up blank

I’m trying to use a graphviz chart for the first time. Everything else I’ve tried works. I’m using the chart definition from the user guide. The page comes up but its blank. I can create a the graphviz object in plain python and it looks correct.

My python default was 3.9, so I’ve switched back to 3.8. No change.

What can the problem be?

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The issue is reported in the github repos as #1331:

st.graphviz_chart examples not rendering #1331

The fix given in there works for me in firefox and chrome, although not in edge.