Launched in Prism Launcher
Minecraft 1.19.2 Fabric Loader 0.17.2

Active mods
- Fusion:                   1.2.10-fabric-mc1.19.2
- Rechiseled                1.1.6-fabric-mc1.19.2
- Supermartijn642configlib: 1.1.8a-fabric-mc1.19
- Supermartijn642corelib:   1.1.18a-fabric-mc1.19.2
- Fabric API:               0.77.0+1.19.2
- Sodium:                   1.19.2-0.4.4+build.18
- Sodium extra:             0.4.16+mc1.19.2-build.90
- Reeses sodium options:    1.6.4+mc1.19.2-build.93
- Indium:                   1.0.9+mc1.19.2

Description:
Similar to #155, some overlays of the grass_block appear gray and do not respect the biome grass tinting.

Tested variants:
Crimson, Gravel, Mud, Mycelium, Podzol, Red Sand, Sand, Warped Nylium — all seem to render correctly, except the south-facing grass and its side textures, which appear to miss their biome tint.

File Named glass Instead of grass
I noticed a small possible mistake in the file:
Fusion Block Transitions v1.0.1 for Minecraft 1.20-1.21.8.zip\assets\fusion_block_transitions\fusion\model_modifiers\blocks\glass_overflow.json
the .json file is named glass, which I assume might be intended as grass. Not sure if this is actually an error, hope this doesn’t come across as nitpicking! Just wanted to report it in case it’s helpful.
However, I changed the .json file name to grass, and the tint error persists.

Questions / Thoughts
I received a warning message, log:
[main/WARN]: Reference map 'supermartijn642configlib.mixins.refmap.json' for supermartijn642configlib.mixins.json could not be read. If this is a development environment you can ignore this message
How relevant is this warning to any potential issues the Fusion mod might have with its dependencies?

Finally, I want to thank you for your amazing work, both for your patience and for creating such a great mod. Sorry if Minecraft 1.19.2 is a bit old for you, and I hope it’s not a bother to receive a message from me!

When applying the tinting, it was sometimes getting a neighboring sprite when looking up the sprite of the quad. Not too sure why, but it should be fixed now in Fusion version 1.2.11.
Thank you for reporting the issue!

I noticed a small possible mistake ... the .json file is named glass, which I assume might be intended as grass.

Whoops that is indeed a typo and meant to be 'grass'. The name of the block model modifier file, as long as it is unique, doesn't really matter, so it won't affect anything.

I received a warning message, log:
[main/WARN]: Reference map 'supermartijn642configlib.mixins.refmap.json' for supermartijn642configlib.mixins.json could not be read. If this is a development environment you can ignore this message
How relevant is this warning to any potential issues the Fusion mod might have with its dependencies?

Fusion has no relation to or interaction with my config library. As for the actual warning, it doesn't affect anything and you can safely ignore it.