Place structure pipes and birch planks in your assembly table, but no sign of the matching façades.

Seems that the ore dictionary is applied when making plank façades, and if there are more than 7 (one slot for pipe plugs) then the mod-plank-façades push the ones matching the supplied components are pushed.

Removing one plank adding mod (eg. Natura) is removed the selection changes (eg. to Extra Tree's planks) but the issue remains.

I would have expected only the façades exactly matching the supplied planks to be available.

Vrsion information: MC 1.6.4, FML 9.1.11.916, BuildCraft 4.1.2, Natura 2.1.11, Forestry 2.3.0.5, Binnie’s Mods (for Extra Trees) 1.8-dev2 (and many other mods).

within the unoficial buildservice there is a changelog. within the changelog there is more than a few references to the Assembly table and the Ore Dictionary.

However I have no Idea if there is any correlation.
http://nallar.me/buildservice/job/Buildcraft/229/changes
http://nallar.me/buildservice/job/Buildcraft/393/changes
http://nallar.me/buildservice/job/Buildcraft/396/changes

so on the short list there is a few related items but I have no idea 'how' related.

Hope this helps

As far as I know, the Assembly Table doesn't support the Ore Dictionary.

Speculation of cause on my part should not be taken as a diagnostic :-)

"It appears as if" might have been a better was to phrase it.

Yes, a PR was submitted, it was fail, so it was reverted. It hasn't been touched since.