Custom blocks palette adjustment

[joojoooo]

I made a protocol translator (1.20.0 to 1.20.50), a lot of the code I copied from this repo and tedac. It works fine on nukkit or pmmp servers. The issue is The Hive, they use custom blocks in StartGame, persistent block palette in LevelChunk... Sending the original LevelChunks crashes the client, even if there were no chunk changes between these 2 protocols, If I convert the persistent states to runtime ids the client doesn't crash, the only issue is all the blocks are wrong. I think the palette adjust code must be wrong or outdated. By not sending custom blocks in StartGame and not adjusting for them then the conversion is correct for at least the few non custom blocks, but since 99% of the blocks used on Hive are custom, that's not a viable option.
Do you have any advice on how I can properly downgrade those chunks?

[joojoooo]

CustomiesDevs/Customies@87ee606

I think this also affects 1.20.50 but I'm not sure. If so, different versions will need different adjustments

[Flonja]

I haven't played around with custom items and blocks a lot, so what I currently have is likely broken

[joojoooo]

When the server is sending custom blocks with "properties", the convert() function in custom_blocks.go fails to cast []int32 "enum" into []any
But even with that fixed (i guess), runtime ids are still wrong

[joojoooo]

I know the issue is not my chunk conversion code because this is without sending the client custom blocks nor adjusting for them, as you can see non custom blocks are converted successfully to the old runtime id:

This is by sending the blocks and using your adjust code: