Check out the attached font. When rendering in QML I get warning spew as below and the text doesn't render. If I disable distance fields, the font renders.

In looking at the code, it seems that perhaps qsgadaptationlayer.cpp doesn't handle cases where the font has a small subset of glyphs? Hard to say. This font only has some basic english letters and numbers in it.

Warning Spew:
============

Warning: distance-field glyph is not available with index 32
Warning: distance-field glyph is not available with index 116
Warning: distance-field glyph is not available with index 104
Warning: distance-field glyph is not available with index 101
Warning: distance-field glyph is not available with index 32
Warning: distance-field glyph is not available with index 108
Warning: distance-field glyph is not available with index 97
Warning: distance-field glyph is not available with index 122
Warning: distance-field glyph is not available with index 121
Warning: distance-field glyph is not available with index 32
Warning: distance-field glyph is not available with index 100
Warning: distance-field glyph is not available with index 111
Warning: distance-field glyph is not available with index 103
Warning: distance-field glyph is not available with index 46