I can add the info that: 1) Older versions of glade (i.e. 3.18) that worked before, crash with the current library set. 2) the snap version of glade does work on Ubuntu MATE focal.
I can add the info that:
1) Older versions of glade (i.e. 3.18) that worked before, crash with the current library set.
2) the snap version of glade does work on Ubuntu MATE focal.