Phantom points on multiple time series in tooltip

[cbaker]

• [x] I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

Steps to reproduce

Hover over to draw the tooltip and there will be "phantom" points as I call them with no active dot where the values seem to be inherited from each other.

What is expected?

If there is no value for hovered time, do not show the value.

What is actually happening?

An inherited value of sorts is being displayed in the tooltip.

Environment	Info
Recharts	v2.0.8
React	16.14
System	20.10
Browser	Chrome 89.0.4389.72

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Downsampling time-series data for each series with LTTB before render. I think the problem is that the two series don't start at the same time so idx 0 is at different times on each line?

[cbaker]

use allowDuplicatedCategory={false} I do note, this isn't an obvious prop for an XAxis of type "number" vs type "category"