Graphical inconsintency in bump chart when using "Streams" field

[andreabenedetti]

In which chart does the bug happen?

• Bump chart

Web browser and version Firefox 89.0.2

Operating System macOS 11 Big Sur

Steps to reproduce this

Project file https://gist.githubusercontent.com/andreabenedetti/993efe82c2cda30e12f14232903dd0d1/raw/a39f6573230d3fe33a18f1a1640fbc85816a1e92/issue-bumpchart.rawgraphs

Additional context When specifying the "Streams" field the same as "Series" an unexpected curve interpolation appears at the end of each small multiple area chart: a small upright tail appears.

Expected behavior

Unexpected behavior

[mikima]

issue closed, will be visible from release v1.0.0-beta.23