I found the problem!
The typelib files are stored in $SNAP/usr/lib/x86_64-linux-gnu/girepository-1.0
, so, following the advice found in this topic, I added GI_TYPELIB_PATH
to my snap’s environment:
apps:
qabro:
command: qabro
environment:
GI_TYPELIB_PATH: $SNAP/usr/lib/x86_64-linux-gnu/girepository-1.0
...
and now it runs fine!