the -m option crashes
i've been trying to use gnome-builder -m /home/mclasen/.local/share/flatpak/runtime/org.seul.pingus.Sources/x86_64/stable/active/files/manifest/org.seul.pingus.json to use the Sources extension from flathub to do easy developer setup, but after downloading the sources, it crashes, both with master and stable builder.
16:54:47.0570 ide-gtk[ 5]: CRITICAL: ide_widget_get_workbench: assertion 'GTK_IS_WIDGET (widget)' failed
Thread 1 "gnome-builder" received signal SIGSEGV, Segmentation fault.
open_after_timeout (user_data=0x555556376ec0) at ../src/plugins/flatpak/gbp-flatpak-clone-widget.c:257
257 ide_workbench_open_project_async (workbench, req->project_file, NULL, NULL, NULL);
(gdb) bt
#0 0x00007ffff75eafc1 in open_after_timeout (user_data=0x555556376ec0)
at ../src/plugins/flatpak/gbp-flatpak-clone-widget.c:257
#1 0x00007ffff6cbd3f3 in () at /lib/libglib-2.0.so.0
#2 0x00007ffff6cbc96a in g_main_context_dispatch () at /lib/libglib-2.0.so.0
#3 0x00007ffff6cbcd28 in () at /lib/libglib-2.0.so.0
#4 0x00007ffff6cbcddc in g_main_context_iteration () at /lib/libglib-2.0.so.0
#5 0x00007ffff727a7ad in g_application_run () at /lib/libgio-2.0.so.0
#6 0x000055555555565b in main (argc=<optimized out>, argv=<optimized out>) at ../src/main.c:175