You forgot to include the crash report you mentioned...

How did you open the saved file? With a double-click or from the Open recent menu?
Did you also try to run Sweet Home 3D with Rosetta?
Could you also check how it works with the version https://www.sweethome3d.com/downloads/S ... -2.3.2.dmg which runs with an older version of JOGL (as this version can't be notarized, you'll have to launch it the first time by clicking on Sweet Home 3D icon while maintaining control key pressed and choosing Open item)?