Using a texture pack with custom font PNGs, non-latin European characters which worked great in 1.13 are completely mangled in 1.14 (pre release 5).
It looks like the it can no longer find the location of the desired letter.
The texture pack contains replacements for accented.png, ascii.png and nonlatin_european.png. Only nonlatin_european.png is messed up.
The texture pack reduced to fonts only is attached.
The resource pack uses a custom font without specifying which characters it modifies, which should be done using
assets/minecraft/font/default.json
(oralt.json
, respectively). As such, Minecraft uses the vanilla mappings instead, which don't match with the font spritesheet. Therefore this behaviour is intended.