Minecraft wiki entry for Recontinued, associated text: From the introduction of leaves in Beta 1.2 onward to the Flattening of 1.13, leaves used numerical data values within the leaves block to hold their type. As only three species existed from Beta 1.2 to release 1.1, with data values 0/1/2 (and by extension 4/5/6, 8/9/10 and 12/13/14), a data value of 3, 7, 11 or 15 would produce an undefined leaf type. This block appeared identical to conventional oak leaves, but appeared to use the spruce tint.