Petroleum gas becomes water in pipe

[trigger]

Hi, I think I found a bug: when connecting pipes with petroleum gas storage tank on one side, and chemical plant on the other side, the petroleum gas becomes water magically.

Dismantling and rebuilding same pipes still reproduce that.
Dismantling and placing pipes some other way fixes that.

Maybe it's affected by underground water pipes way above the screen, as the magic happens roughly on the same longitude.

Screenshot and save file in attachments

[Bilka]

After replacing the pipes by deleting the pipes filled with water, starting on the right, I can erase the water from the pipe:
Looks like you accidently connected your pipe to the water pipe. When you try to delete the pipes that are filled with water, you have to start with the pipe nearest to the next tank because the liquid from the pipe that you try to delete tries to go into other pipes. When you start with the water pipe nearest to the tank, the water is forced to the left, because it prefers joining with the other water instead of the petroleum gas. Then you can safely delete the other pipes because water and pertoleum are no longer connected. If you delete the most right water pipe last, all the water in it is forced to go somewhere, so it goes further up the petroleum pipe.

[Loewchen]

There is water in the pipe, that does not mean the gas becomes water. Unless you can show that replacing all pipes and the tank still results in water in the pipe I would assume you just misconnected the pipes before.