Request pipe, null pipe, Routed Interface Pipe, chest. Placing a stack each of Oak Saplings, ID: 6, and Birch Saplings, ID: 6:2, and then requesting oak, i do indeed get 16 oak, but when opening the chest, i am instead missing birch saplings, while the oak stack is untouched. Not sure if this is an issue with meta tags, or if the mod is ignoring metas entirely. MC 1.6.4, latest Forge *.965, windows OS

Fixed in 4.3.6. Dont report issues on older versions

You haven't specified what version of project red you have.
Seems similar to issue #366
Possibly fixed in latest build (4.3.7.32)

Indeed seems similar, Currently using Project Red 4.3.5.30, so will see if the updated version fixes the issue for me.