I think this is just a fact of life with software development.
These applications are so complex that sometimes a change causes some unexpected effect somewhere else in the software one would not expect.
I don't think this is an ARCHICAD-only phenomenon.
I remember many years ago when a new Windows version came out (XP or Vista or something like that), it was said in newspapers that Microsoft knew about 64000 know bugs in it at the launch.
Not trying to belittle these bugs or issues, but CAD/BIM software applications are just very complex pieces of stuff with millions of lines of code.
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