BuildCraft version: 7.99.15
Forge version: 14.23.2.2611
Link to crash report or log: -
Singleplayer or multiplayer: Singleplayer
Steps to reproduce: place a striped pipe (the yellow and black one), and put an other one wich will destroyed the first one, when it detroyed it, the striped pipe became a void fluid pipe (the pipe who destroye fluids)
Additional information:
I powered the striped pipe with creative engine.

This might have been fixed in 7.99.16 already. Can you try using this prerelease?

could you maybe provide some screenshots? i have no idea what exactly you are saying to make this bug heapen

The screenshots :
Before
https://image.noelshack.com/fichiers/2018/14/2/1522775193-2018-04-03-19-04-13.png
After
https://image.noelshack.com/fichiers/2018/14/2/1522775193-2018-04-03-19-04-58.png

Ps: the version of minecraft is 1.12 not 1.11

With this prerelease, the pipe disappear when it is broken. This is what must happen?

not realy, if a striped pipe breaks a pipe that pipe should be what comes out

With the release that alex told me, it happened what I've said. So the problem still exist except that it is not a pipe replacement now...