TTF files appear to be rendered wrongly

The bug

ttf files loaded by the game appear to render very strangely compared to bitmap fonts.

How to reproduce

A resource pack is attached to this issue that includes four font files:

• seven.ttf: the font file initially distributed with Minecraft 1.13-pre6

• mojangles.ttf: the font file used by Bedrock Edition

• minecraft.ttf: a seemingly unused font file which was present in Pocket Edition from v0.8.0 alpha build 2 to v0.10.4 alpha

• minecraft_ten.ttf: another font file Bedrock Edition uses

To reproduce:

1. Download and apply this resource pack

2. /tellraw @p {"text": "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"}

3. /tellraw @p {"text": "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", "font": "seven"}

4. /tellraw @p {"text": "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", "font": "mojangles"}

5. /tellraw @p {"text": "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789", "font": "minecraft"}

Expected results

The output for all four of these commands would look roughly the same.

Actual results

They look gray and smudged.

Further notes

The font atlases produced by F3+S appear red instead of white - is this standard behaviour for ttf files? In addition, all of the characters are added to file 1_0, rather than 0_0.