Adding a font to the default stylesheet causes corrupt glyphs to draw

[timojch]

Repro

1. Modify the Fonts block in default_ui_skin.mms so that it reads as follows

<Fonts UsedSpace="0, 0, 1024, 160">
	<Font Id="default-font" File="Inter-Regular.ttf" Size="20"/>
	<Font Id="tooltip-font" File="Inter-Regular.ttf" Size="16"/>
	<Font Id="monospace-font" File="Consolas.ttf" Size="18" />
</Fonts>

2. Add a Consolas.ttf as a resource to the Myra.Monogame project with the path Resources.Consolas.ttf. (Any TTF file should work as long as it matches the above)
3. Draw a UI containing two or more widgets which contain text using default-font.
4. Change one of the widgets to use monospace-font.
5. Draw the UI again.

Expected Result

The UI should draw with one label using the original default and the other font using Consolas.

Actual Result

Everything draws correctly before the font change.
After the font change, the Consolas label draws correctly, but everything that was using the default font draws garbage.