Trouble allocating fonts in a Tcl/Tk (Python 3.5) based snap

[Kushal Chauhan]

snapcraft version - 2.33
snap - https://github.com/kushalchauhan98/minimal-snip

I am trying to snap a single python3 script.
The code goes something like this: http://paste.ubuntu.com/25262415/

The python script (.py file) runs just fine when executed normally. But when I prime the snap and try it, I get this error on run: http://paste.ubuntu.com/25262438/

The font I am using in my app is the default one offered by tkinter. I haven't chosen any font explicitly to be used in my program.

Initially, I was getting a error which I solved by referring to this question on AskUbuntu (https://askubuntu.com/questions/815511/setting-a-tcl-tk-library-path-inside-a-snap-package).
But now, I am getting this error, which seems to be a snapcraft bug.

[eike (eikekuehn42)]

snapcraft version - 3.8
core18
python3

I'm trying to snap a python3 tkinter script which runs fine as a python package. I've broken it down to just opening a tk-window which results in a SEGFAULT. Seems to be the same or the evolution of the bug reported above. Will provide a minimal example of the crash this evening.

[eike (eikekuehn42)]

I've created a minimal example to reproduce the bug:
https://github.com/randomchars42/snap_python_tkinter_skeleton

Produces:
initialising tk: window = Tk()
done
adding window title: window.title(TEXT)
done
creating a label: label = Label(window)
Segmentation fault (core dumped)

Not sure it's the same though, as it gives a SEGFAULT instead of: "_tkinter.TclError: failed to allocate font due to internal system font engine problem", so I opened a new bug (https://bugs.launchpad.net/snapcraft/+bug/1847321) which might eventually be merged if it proves to be the same.