The way to achieve what you want is probably execute the same, without the clean stage.
Unfortunately, there is a problem with the maven shade plugin that fails such execution without priorly cleaning. It seems the plugin relies on former constructs when creating artefacts, and fails for duplicated entry.
We currently can't prioritize investigating why this happens and what needs to be fixed. If you wish to take a look on that, we will be happy to hear what you learn .
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