Factorio Forums

What did I do?
Clicked and held on an existing belt, got the "Transport belt is in the way" message, dragged over an underground belt expecting it to be replaced with belt, but nothing happened.

What happened?
Underground was not quick replaced. Belt was placed on empty tiles. Underground was left unchanged.

What did you expect to happen instead?
Expected the underground to be quick replaced as I dragged my cursor over them.

Write down the steps to reproduce the bug if you know them.
Have a setup like below where all belts/underground are facing the same direction Attempt to place a belt on one of the existing belts and dragging to the other existing belt. The result will be Does it happen always, once, or sometimes?
Always.

log

Confirmed on 0.17.5 and that it does not require the first piece of belt to fail; replacing an underground by hold-and-drag does not work at all.

Yup, just came back to update that the first click doesn't matter. However it seems to quick-replace if you drag over them quickly.

Thanks for the report. That is working as intended and is even mentioned in the 0.17.0 changelog: you can't fast-replace entities of other types unless you begin with the mouse-down on that entity.