BuildCraft version: 7.99.16
Forge version: 14.23.3.2677
Link to crash report or log:
Singleplayer or multiplayer: singleplayer
Steps to reproduce: A reversed creeper of elemental creepers needs to explode with a pipe of any type near
Additional information: The pipes are black and purple and do not connect after making the bug, here is an image of the pipes:

this is weird and a bit similar to #4156 could you report this to ICBM clasic as well? (atleast i think those elemental creepers are from that mod, if not please report to the mod that adds them)

looks like something is corrupting the TE's