[1.21.3 - Bug CIT & Maybe Other] Path as ./ and maybe other not working anymore

[ReallyNotNothing]

Description of Issue

Upgrading resource pack from 1.21.1 to 1.21.3, now it says that it is not possible to use ./ as file path. In 1.21.1 it was working fine.

Console Error: Invalid path minecraft:textures/./chest5.png: Invalid segment '.' in path 'textures/./chest5.png'
Console Error: Missing sprite: minecraft:textures/./chest5.png
"chest5" file path: assets/minecraft/optifine/cit/block/chest/chest5

"assets/minecraft/optifine/cit/block/chest/chest5" file list:

• chest5.json -> "textures": {"0": "./chest5"},
• chest5.png
• chest5.properties -> model=./chest5

In the GitHub documentation it says that it is still possible to use it.

OptiFine Version

OptiFine_1.21.3_HD_U_J2