BuildCraft version: 7.99.24.1
Forge version: 14.23.5.2838
Link to crash report or log: 2019-06-30-7.log.gz
Singleplayer or multiplayer: Singleplayer
Steps to reproduce: Launch Minecraft with mods listed below and try to view or place pipes.
Mods installed:
BuildCraft
Forestry
Railcraft
OptiFine
Additional information: The textures of pipes, engines, some paintbrushes, and other items are not rendering. They can still be placed in the world but still do not render when placed. When destroyed, the particles have the missing texture pattern (black and magenta checker). I've seen this bug reported before but only as recently as a few years ago and the fixes usually involved turning off antialiasing on OptiFine, which did not help, and removing OptiFine, which caused the textures to render but the particles are still broken.

Also, the items that fail to render, pipes, engines, etc, still have broken particle textures even with all other mods uninstalled, so I guess only part of the issue is mod compatibility.

Some screenshots:

try a newer forge version

I don't think 8.0.99.99 is a real forge version? Can you upload one of your latest log files to see what version you are actually using? (Also to see if there is an update to optifine that might help with this).

Missing particles is definately not caused by optifine, however it's quite a minor bug so I'm unlikely to fix it anytime soon.

Sorry, that was the version of Forge Mod Loader, not Minecraft Forge. My Minecraft Forge version is 14.23.5.2838.

2019-06-30-7.log.gz

Here is my latest log file. It was too large to make a paste out of.