• Forge Version: 14.23.5.2855
• BuildCraft Version (Add Hash if from github): 7.99.24.8
• Any additonal mods: Optifine, FoamFix, JourneyMap

Steps to reproduce the behavior:

1. Load in a world in Creative Mode
2. Go to Inventory and Select Buildcraft / Buildcraft X
3. See missing textures in some blocks.
   
4. Place down a pipe in the world
5. See missing texture in world.
   

Both the all package and individual JAR files when installing BC to a Minecraft install reproduce the same texture issues.

Happened to me once years back. Only happened on the one version I played. I don't remember much. I couldn't recreate it. I know this doesn't help, but this could be client-side is all I'm saying.

Haven't worked on this in ages, but I believe there is a conflict with Optifine or at least one of the settings. It is very hard to fix because the code for optifine is unavailable.

I just ran MC again without Optifine and looks like it is a Optifine issue. I may look a bit into it to see if any setting in there may be causing it and see if it may be of use to anyone to fix the issue.

OK so the issue mainly stems if the user has Anisotropic Filtering or Anti-aliasing on in Optifine. Somehow the textures when Optifine tries to "enhance" it makes it so that the textures become non-existent in game. IDK if more settings in Optifine affects it but I have everything on except a few settings like bobbing and the 2 mentioned above and the textures appear as normal. IDK if it can be mitigated due to how the code for Optifine is closed-souced but that's all the notes I can take from it and see what the BC team can take from it and say it's a thing we can or cannot do.