Group By example produces schema error

[tboerstad]

The Group By example, https://plot.ly/javascript/group-by/, produces a Schema Error for each of the three groups if you call Plotly.validate(). See the developer console in this example:
https://codepen.io/tboerstad/pen/povxLGq

The error message is "In data trace 0, key transforms[0].styles[1].value.marker is not part of the schema".

The functionality seems to be working as intended

[etpinard]

Thanks for reporting!