"Use relative E distances" produces flawed G-code

[Lyl3S]

Description of the bug

When "Use relative E distances" is checked and the model is sliced, the preview shows the model and skirt as lots of disconnnected line fragments and the "Sliced Info" stats shows 0 meters of filament being used.

I assume that the the print will be just as flawed as the preview so I never actually tried printing the model. This problem did not exist in the previous version of PrusaSlicer that I used: 2.6.1. I've reverted to 2.6.1 and the problem exists there too, so I don't know if was mistaken or if the problem is from corrupted configuration that is shared by all versions.

Project file & How to reproduce

Go to the "Printers" page, the "General" tab, the "Advanced" section, and check "Use relative E distances".

Slice it and the preview will show the flawed slicing.

Uncheck it and the slicing will be normal.

Check it again and the slicing will be flawed again.

PrusaSlicer-project-dome-10x10x5.zip

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

Version 2.9.0

Operating system

Windows 10

Printer model

FlashForge Creator Pro