Bubble chart image symbols not scaled when point z value is below minimum

[cebamps]

Expected behaviour

When a point in a bubble series is out of the zMin/zMax range for the series and uses an image symbol (symbol: "url(...)"), it should be skipped or displayed at a small size.

Actual behaviour

The image is instead rendered at the wrong size and in the wrong place.

This error also appears in the console:

Unexpected value NaN parsing y attribute.

Combined with #17280, points in bubble charts can easily fall out of range and trigger this bug if one of the series has a minimum z value of 0.

Live demo with steps to reproduce

https://jsfiddle.net/6v2a1ow4/

Product version

Highcharts v10.1.0

Affected browser(s)

Firefox, Chrome

[raf18seb]

Hi @cebamps, thank you for creating the ticket.

Workaround:
If point.plotY is not calculated, set it a fake value anyway: https://jsfiddle.net/BlackLabel/756kgp0r/

Internal note:
In the translateBubble method, point.plotY is not calculated (and this is good for both symbol as URL or a normal marker). Somewhere later, the normal symbol marker is handled correctly, whereas the URL symbol is not.