(snap) Saving without specifying the svg extension (.svg) doesn't add it back

Summary:

I'm a graphic designer, I use Inkscape on a daily basis. Though, version 1.2 is showing many issues on Ubuntu 22.04 LTS. I'm using Snap version since the one supported on the ubuntu official repository is still Inkscape 1.1.2.

Main issue: 2. I cannot save files without specifying manually the .SVG extension even if the SVG filetype is selected from the dropdown list

So if you:

• open Inkscape
• File > Save as
• Enter a filename without ending with .svg
• Save

You don't get a file with .svg anymore.

Other issues (these are more important, but are tracked elsewhere):

1. I cannot open an SVG file by double clicking on it from nautilus file browser. The only way I can open an SVG file is to open Inkscape and then click on file»open, tracked in #3649
2. I cannot export a png file without specifying manually the PNG extension even if the PNG filetype is selected from the dropdown list
3. The export path is not correct (for instance, my home folder is shown as /home/user/snap/inkscape/10442), (similar to #2490 and #1507 (closed))
4. I cannot drop an image into the canvas (either jpg or png), tracked in #3624

Version info

Inkscape 1.2.1 (0f2f062a, 2022-09-21, custom)

GLib version:     2.72.1
GTK version:      3.24.33
glibmm version:   2.66.2
gtkmm version:    3.24.5
libxml2 version:  2.9.13
libxslt version:  1.1.34
Cairo version:    1.16.0
Pango version:    1.50.6
HarfBuzz version: 2.7.4

OS version:       Ubuntu Core 22

Snap Version on Ubuntu 22.04.1