Automatically place a pipe when two undergrounds are placed at a corner or one space apart.
Providing the player with new tools or adjusting the game interface, without fundamentally changing gameplay.
When copy and pasting some of my oil refinery setups, sometimes a chemical plant will disappear due to this mod. Once I disabled it, the problem stops
Also mod leaves a a few unconnected straight pipes when I delete said oil refinery
Try the mod with this blueprint - copy and paste it etc - and see the upper middle light oil cracking chemical plant get deleted
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https://github.com/sparr/factorio-mod-automatic-underground-pipe-connectors/issues/9