I noticed an odd behavior with tooltips in multiseries scatter graphs. It appears that one needs to add a tooltip column to the data for each series' y column instead of just a single tooltip column for all series y columns. This is somewhat confusing to me since, if I understand correctly, each row of scatter graph data may only contain one single non-null value across all y columns. If that is the case then a single tooltip column should really suffice since the tooltip value could not be associated with more than one scatter graph dot. Is this by design or a bug? Could it be improved to where having a single tooltip column for all y columns in scatter graph data would work?
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