When radar graph has ticks reversed, fill is the wrong way round in 2.9.1

[hexydec]

Expected Behavior

The chart fill should start in the middle and end on the chart line.

Current Behavior

The fill starts at the edge and stops on the chart line.

Possible Solution

Unknown.

Steps to Reproduce (for bugs)

See https://codepen.io/hexydec/pen/jOOLRKv. When the same setup is run in v2.8.0 the fill is correct.

Context

Regretion in new version.

Environment

• Chart.js version: 2.9.1
• Browser name and version: Firefox Developer Edition, Chrome Latest
• Link to your project:

[stockiNail]

Could be related to PR #6281, Using fill: start it works for me

[hexydec]

Can confirm that adding "fill": "start" does fix the issue. So yes, the default is not backward compatible.