[2.0.20] Cannot load save: "Transport line groups are not consistent"

[zokoban]

Hello,

I am having the following text box appearing when trying to load my save: "Transport line groups are not consistent".

When acknowledging it, nothing happens.

I don't know what to do to solve this issue... Any clue on what I should do ?

I don't have any extra mods neither did I do anything out of the vanilla game.
My factorio game is up to date too.

The issue is on my save and the 3 automatic saves too.

[boskid]

Thanks for the report. This is quite suspicious, it is possible to load this save file in prototypes changed mode (holding Control when clicking "load" in the load gui) and i see that one of the undergrounds on vulcanus at position {16.5, 5.5} is in a weird state:

12-05-2024, 19-56-12.png (481.49 KiB) Viewed 292 times

It looks like by removing it and rebuilding that underground the save file becomes correctly loadable without need to use prototypes changed mode. I will have to investigate what is wrong with this underground that makes it not connect lines correctly.

[boskid]

This was quite slow to analyze but it looks that the cause of consistency is an underground belt ghost that exists right under the real underground belt at vulcanus at position {16.5, 5.5}. I will need any clues about what was happening here: were you using blueprints? super force building? smart belt building? upgrading or deconstruction planner?