Zen Dots: lowercase "b" and "d" render incorrectly in Blender (overlapping components) #11140

Font: Zen Dots Regular (ofl/zendots/ZenDots-Regular.ttf)

Description

When Zen Dots is used in Blender, the lowercase "b" and "d" show fill artifacts in the viewport. After converting the text to a mesh, the stem goes missing (for example, "d" turns into a "c"). Every other glyph renders correctly.

Note: the upstream repository (googlefonts/zen-dots) is archived, so this needs to be fixed directly in the google/fonts binary.

Cause

Both glyphs are composites of the same two components, and the components overlap:

The stem (l) crosses the bowl (bellycomb), and their bottom edges coincide along y = 0. Renderers that don't fill with the nonzero winding rule can't resolve this. Blender's text fill is one of them, and it doesn't support crossing contours (see blender#42071). No other glyph in the font has overlapping components.

Separately, the mirrored components in d give its decomposed contours reversed (counter-clockwise outer) winding, because FreeType doesn't correct direction for mirrored sub-glyphs (see freetype#883).

Suggested fix

Make b and d simple glyphs with the overlaps removed and correct (clockwise) outer winding. With fontTools, running removeOverlaps on the font and then reversing the contours of d produces clean outlines for both glyphs (one outer contour plus one counter). I've confirmed this fixes the problem in Blender.

Steps to reproduce

1. In Blender, add a Text object and load ZenDots-Regular.ttf as its font.
2. Type b or d. Fill artifacts appear.
3. Run Object → Convert → Mesh. The stem is missing.