Shading and opacity is now fixed but back faces are still being culled when they shouldn’t be.
This was resolved in 1.19.70
The pack imports and applies to the world fine for me (1.20.51 stable/1.20.60.23 preview)
Preview 1.20.10.20 has added support for Molang expressions
I think this is intended
I think the colours are like this on Java too. When glow ink sacs get added in 1.17 you will be able to use them to make signs bright again.
Interesting, maybe it would be better if propagates power defaulted to the value of redstone conductor or if the wire cutting, comparator stuff were separate parameters in redstone conductivity