Radar chart rendering issue

[stockiNail]

Expected Behavior

BE AWARE this issue was solved in 2.9.3 version (see the issue #6396).

The rendering of a radar chart works correctly with version 2.9.3.

Current Behavior

Using the development build, the rendering of the chart will apply a "white" area in the middle of the chart itself.

Steps to Reproduce (for bugs)

https://codepen.io/stockinail/pen/KKdOXRM

Environment

• Chart.js version: DevBuild: https://www.chartjs.org/dist/master/chart.min.js
• Browser name and version: FF 76.0.1

[etimberg]

Adding fill: 'start' works around it. https://codepen.io/etimberg/pen/pojMazo

Will need to figure out what changed

[etimberg]

v2.9 defaulted to fill: 'start'. Looking to see why that changed https://github.com/chartjs/Chart.js/blob/2.9/src/controllers/controller.radar.js#L17

[etimberg]

Looks like we fixed the backwrard incompatibilty in #6655 but never PRed that to master. I will do that since the default is a lot better.

[stockiNail]

Adding fill: 'start' works around it. https://codepen.io/etimberg/pen/pojMazo

Will need to figure out what changed

@etimberg Yes, I was aware about that as workaround.