MC: 1.12.2
Forge: 14.23.5.2854
Rockhounding Core: 3.26
Rockhounding Rocks: 3.21

Both the Stone Rammer and Cutting Station output Oak Wood Plain Blocks when supplied with Birch, Spruce, Jungle, Acacia or Dark Oak planks, instead of their respective wood plain block variants. JEI shows that the recipes should work as intended, and yet only oak plain blocks are produced.

Tested this with JEI, JEI Integration and The One Probe, but these should not affect this anyway, but the bug persisted. Also with default configs.

EDIT: Red sandstone is also affected -> yellow sandstone blocks are created instead.