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Players can place torches directly on grass in order to bypass the soft materials restriction.

Just an FYI, "latest" isn't a version.

Idk if grass is considered a soft material.

Ok I think that "grass" is what's missing from soft materials, since you normally can't place blocks on top of such blocks. (Whereas "Grass_Block" is on the list.)

Will add.

According to #195 (though still pending /version and /version ExtraHardMode output) this issue still hasn't been fixed, unless tall grass is a different material than what's depicted here.