ID 496955 - Painting when using new brush engine can produce artifacts

Problem summary
Painting when using new brush engine can produce artifacts

Customer reported version
Mari 5.0v1

Customer reported platform
Windows 10

Steps to reproduce

1) Open any project

2) Create a Paint node filled with black

3) Paint white strokes back and forth

Expected behaviour
Paint should be applied to the Buffer without artifacts.

Actual behaviour​​
Artifacts appear around the edges of the strokes:

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Workaround
Enable Tool Properties > Brush Settings > Color > Use Legacy Coloring

Reproduced by support
This bug has been reproduced in:
Mari 5.0v1 - Windows 10 - CentOS 7.9
Mari 4.8v1 - Windows 10 - CentOS 7.9 - regression

Unable to reproduce bug in:
Mari 4.7v5 - Windows 10 - CentOS 7.9

Earliest version tested
Mari 4.7v5 - This issue doesn't appear in this version and has regressed