Empty project/Crash in Kicad 5.99.0-2358-g6d8fb94d

Updated Kicad yesterday from git. Since then, when I open a project (which I edited just before the update) Kicad can't find any files in the project (no *.kicad_pcb no *.kicad_sch). It just says "Empty project" Right clicking in that window immediately crashes Kicad with a segfault (nothing in the console window)

Steps to reproduce

1. Worked with projects with in the old format (*.pcb, *sch)
2. Opened them with the Kicad git version and saved to the new format
3. Updated to the version mentioned above and tried to open the project again

KiCad Version

5.99.0-2358-g6d8fb94d

OS: Arch Linux (updated everything also yesterday)