The resource pack attached to MC-214686 offers a complete fix for this issue. Mojang have my full permission to (and are encouraged to) replace the affected vanilla model files with the contents of the resource pack.
The bug
Unlit redstone torches are lit the same on all sides despite not currently producing light, giving them a slight out of place feel.
How to reproduce
Place down 2 blocks
Set a redstone torch on one and a fence post on the other
Power the block with the torch on it with a lever
Compare the lighting of the torch to that of the fence post
Expected behaviour
The lighting of the torch's faces depends on the face.
Actual behaviour
All of the faces of the torch are seemingly lit the exact same.
[media]How to fix
The resource pack attached to MC-214686 fixes this issue completely.
Linked issues
Attachments
Comments

Fixed in 24w38a
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Comparison image as requested on Discord
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@unknown you're completely misunderstanding what the issue is.
Also please don't use the helper message templates. Consider this a warning.