BuildCraft version: 7.99.15
Forge version: 14.23.2.2654
Singleplayer or multiplayer: SP

When I created fluid pipes (e,g. gold_fluid_pipes) I cannot craft gold_pipes out of them:

Instead, I do the very same with a void pipe, it works.

Same with energy pipes, some do work, others don't.
What is the reason? I searched through the source code but cannot find any hint, where some items are excluded or included. Shouldn't this be consistent through all pipes?

are there any other mods installed?

also is it always working with only a single pipe in the crafting grid vs when there are multiple?

It looks like this was overlooked for recipes.

Thanks for the fix! Why did you reopened the issue?

We keep issues open until we've actually released a version with the fix - so that if some-one else comes along with this bug they have more of a chance to see this (open) issue rather than looking through all of the closed ones.