Factorio Forums

Normally if you have a yellow underground pair and you place a red underground over one of them they both get converted to red. if you have 51 of the red undergrounds when you click on the yellow one only the one you clicked gets converted.

Which version of the game is this in? Can you test it without mods?

Yes this is in the latest beta and happens regardless of mods. I asked the people on the factorion server and they said that they have the same problem

Does it also happen with 42?

I can confirm this issue although I would describe it a bit different. Steps to reproduce:

1. Place down a pair of yellow underground belts so that they are connected.
2. Have at lest two fast underground belts in your inventory.
3. Take only one of them out of your inventory and replace one of the yellow underground belts with it.

What happens
Only one of the underground belts gets replaced.

What I would expect
I would expect that an additional fast underground belt would be taken from the inventory and replace the second yellow underground belt from the pair.

This works with every combination of underground belts regardless whether you are down or upgrading.

Thanks for the report.
This is know issue, the entity placing logic doesn't have a way to account for items outside of player cursor. I agree it would be nice to have this fixed, though.

Seems to work fine as of 1.1.74. Is this fixed?

Indeed.