Editing/Previewing Notebooks or Stacks objects causes Glade to crash

I can't get past this. Whenever I add a Notebook or Stack object, editing/previewing said object causes the viewer to crash. This is happening with both the stock v3.22 version that comes with Mint 20 and the latest version from Flatpak.

With Notebooks - any preview after an edit, usually after trying to change a tab or add a container to one, will dump core. With Stacks - I can get a preview to work, but I not only can't edit/add/delete any pages, but the previewer also coredumps right afterwards.

Everything else works great. My creation/build time has dropped by 90%. But 15 coredumps in the last 3 hours makes the program unreliable at best, unusable at worst.