Hybrid programming problem，c# and python

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I wrote code in wpf, mixed programming to secondary develop fluent, and then asynchronously call the pyfluent script using the python.net library function, when executing pyfluent.launch_fluent, it will open the same wpf ui again, why? I asked the developers at wpf and they said it was a problem with pyfluent.launch_fluent.

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cleanup_on_exit=False,
start_watchdog=False I tried it out, and I set these two to false and it's fine