In leapp framework, generating `.json` report file modifies the passed in report messages, which affects subsequent report file generation, e.g. `.txt` report generation.

The function responsible for generation:
https://github.com/oamg/leapp-repository/blob/4fc0d0b225182bb0ad819de3d22cf16f4bf81a4a/commands/upgrade/util.py#L138

Possible solution:
Use deep copies instead of shallow ones.