I have the same bug, the 2x and the 4x undergfround-pipes are not longer!
please fix it. The belts function perfect.

To fix it youre self, go to youre folder:
C:\Users\YoureName\AppData\Roaming\Factorio\mods\longer-transport2_0.0.5.zip
unzip all to a seperate folder and go to longer-transport_0.0.5\prototypes\x2-x4-pipes-to-ground.lua

Open it with notepad++ (or outher good texteditor) search for (2 times!):
max_underground_distance = 10
and make 10 to: 23, 31

save the file and rezip the folder and override the exist zip: C:\Users\YoureName\AppData\Roaming\Factorio\mods\longer-transport2_0.0.5.zip
Start the game and enjoy.

I hope it helps a little bit.

I have the same bug, the 2x and the 4x undergfround-pipes are not longer!
please fix it. The belts function perfect.

To fix it youre self, go to youre folder:
C:\Users\YoureName\AppData\Roaming\Factorio\mods\longer-transport2_0.0.5.zip
unzip all to a seperate folder and go to longer-transport_0.0.5\prototypes\x2-x4-pipes-to-ground.lua

Open it with notepad++ (or outher good texteditor) search for (2 times!):
max_underground_distance = 10
and make 10 to: 23, 31

save the file and rezip the folder and override the exist zip: C:\Users\YoureName\AppData\Roaming\Factorio\mods\longer-transport2_0.0.5.zip
Start the game and enjoy.

I hope it helps a little bit.

This fix works great, thanks! I did make a small tweak though, I used the distances of 21 (x2), and 43 (x4) for the "max_underground_distance" rather than 23 & 31. This will keep the x2 and x4 in line with what you'd expect. 31 is a bit short for a x4 and the 21 / 43 values will be a direct swap with existing x1 pipe lines