Hm, I found a post about an incompatibility between mac os 10.15 and java opengl (jogl), solution here.

Perhaps adding additional jars for native mac universal gluegen-rt and jogl(-all? or -java3d?) into the lib/macosx and/or lib/java3d-1.6/macosx directories.
Then editing the needed filepath list in SweetHome3DBootstrap.java per mac cases for each java version?