Cubic interpolation borderWidth:0 interpolation issue

[escapedcat]

Expected Behavior

Interpolation should look smooth (without a border)

Current Behavior

Weird bezier issue

Possible Solution

Workaround:
use borderWidth: 1 and a matching borderColor

Steps to Reproduce

https://codepen.io/escapedcat/pen/XWgbqzE

Context

Wanted a smooth cubic interpolation chart without border but width background

Environment

• Chart.js version: 3.5.1
• Browser name and version: OSX Chrome Version 92.0.4515.131 (Official Build) (x86_64)
• Link to your project: -