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Tooltips don't show up in a heatmap

Two months ago I generated this heatmap https://plot.ly/~empet/14324, and at that time it displayed all data on hover.
It has been two weeks since something was changed in plotly.js, I guess, and now only the first row of data is displayed.
Today I ran again the notebook with Plotly 2.0.12, and Python 3.6, but the same odd behavior persists.
What could be the cause of this disappearance of tooltips?

Thanks for the report.

Will be fixed in https://github.com/plotly/plotly.js/pull/1891

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