Tooltip bug on custom series

[AndrewRatnikov]

Version

5.0.2

Reproduction link

https://jsfiddle.net/kbztor76/

Steps to reproduce

1. Use provided example (with option 'trigger: axis' for tooltip)
2. Slide along one bar by mouse
3. In the middle of the bar, the tooltip changes and shows info from the next bar

What is expected?

Should show correct info in tooltip

What is actually happening?

Tooltip shows info from the next bar

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