I would recommend the 8L fix mod - you will need to redo the stations a bit but then the virtual tanker matches tiles and 2 pumps can connect on both sides.

If you have leftovers you can mouse-over them and execute this:
/c game.local_player.selection.destroy()

Might want to pump out oil first ...

Tracked it down to a segfault of KWin with both 0.12.29 and 0.12.30. Seems to be not related exclusively to Factorio. Most of the KDE packages got updated on 5th April after/during I've played 0.12.29 the last time without issues.

This issue can be closed as not-a-Factorio-bug, I guess.

Thanks for the reply. I'll dig little bit into that and try launching 0.12.29 and 0.12.30 without Steam. When I think about it a little further, it might be affected/caused by some Linux/KDE packages updated between 0.12.29 and 0.12.30.

Since today, i.e. 0.12.30, Factorio (through Steam) kills my dual-screen, multi-(virtual)-desktops setup under Linux (openSUSE Leap 42.1) with KDE Frameworks 5.20.0.

Setup:
As seen from log, I have two physical screens with different resolution, the larger being the primary screen.
In addition, I ...

I had the same issue. The problem was FARL v0.4.2. Either removing it or updating to v0.4.3 solved the problem for me.

/edit/
Ok, but that crashes the game when loading a save.