Xml file is changed even though adding a new part fails

bugs
1

When you change the model in the Architect and adding a new part (dependency, task…) fails with an error, the original xml origam file is still changed.

4

I think this is basically a duplicate of Wait task in workflow has wrong namespace

5

It is not. It happens also in other cases, this was just the most recent and easily reproduced.

6

If it is so I think you will need to provide examples. This particular case is not caused by failing when saving but saving a wrong thing and failing to read it back.