fill: 'stack' does not work with stepped lines

[kurkle]

Expected behavior

It should fill to the STEPPED line below

Current behavior

It fills to imaginary non-stepped line below:

Reproducible sample

https://codepen.io/kurkle/pen/mdKNNja

Optional extra steps/info to reproduce

No response

Possible solution

No response

Context

No response

chart.js version

v4.1.0

Browser name and version

No response

Link to your project

No response

[noahmayr]

I'm also running into this issue. I tried to work around it by adding additional points to simulate the steps myself, but that breaks the stacking even more