Investigate transmutated blocks further

[Matriks404]

This might be helpful: https://mcdf.wiki.gg/wiki/Java_Edition

[Matriks404]

I am not really sure what to do with unobtainable variants of usual blocks (that have damage values higher than is normally possible), that do not differ aside from not stacking up with normal damage value blocks.

Unobtainable seamless slabs are at least unique how they are rendered so they count for now, even though they weren't meant to be part of the normal gameplay (see commit 9c87ea0).