Bug: single stargazers data point not drawn

[olets]

I have a repo for which GHRS has logged one row of stargazer data

stargazer-snapshots.csv:

time_iso8601,stargazers_cumulative_snapshot
2023-12-13 23:32:24+00:00,4

That renders with reasonable axes but without a point

 

Maybe there's a bug such that multiple data points are required?