If you revive an underground belt with the belt in your hand, it goes in the way the one in your hand is facing, instead of the way the ghost image is facing.

I also have this problem. As far as I can tell, game logic on which way the belts should face is messing with the mod.

Yes, this is quite annoying - pre-bots I have some lane balancer blueprints which make use of "unusual" underground belt orientations, and I have to manually fix every one of them.

Here is an example: https://imgur.com/yKigsYP

Also see a discussion with the Factorio devs here: https://forums.factorio.com/viewtopic.php?f=7&t=99074&p=548622&hilit=picker#p548622

The following change to 'scripts/reviver.lua' works with Factorio 1.1.36:

https://pastebin.com/xyGs3y4Z

Whole file reviver.lua:

https://pastebin.com/QRtU8AmE

Simply replace the file in the mod '.zip'.

Also have the same issue and can confirm the above fix works a charm, thanks sushi_eater
Wish the author would merge this fix in

He would have done it faster if it was posted to github. Will be fixed in the next release. Thank you!

Can confirm, latest update has this fix :)