GTK3 application via kde-neon extension crashes on open/save

Hi, I am quite new to snapcraft but I managed to publish a GTK3 application via the kde-neon extension ( I played with the other possible extensions (gnome-3-28, gnome-3-34, gnome-3-38) but something was always missing (e.g. the icons used in the application).

I am satisfied with the kde-neon extension, but this time I have problems on saving/loading files. Namely, I get a crash like this:

(aris:280351): GLib-GIO-WARNING **: 12:24:59.911: Error creating IO channel for /proc/self/mountinfo: Permission denied (g-file-error-quark, 2)
(aris:280351): GLib-GIO-ERROR **: 12:24:59.999: Settings schema 'org.gtk.Settings.FileChooser' does not contain a key named 'show-type-column'
Trace/breakpoint trap (core dumped)

I found some relevant issues like this at, and but it seems non-trivial to fix this for a snap.

Is this a known issue? Do you have any hints how to address this? Thanks in advance.

Best regards, Zoltan

Is it possible that kde-neon removes the home plug? If so, this can be the reason of the issue…