It seems their is a bug in the new Lightroom 13.
The ProgressScope on any exportSession seems to be finnishing almost as soon as the export starts.
I have 2 plugins that the ui shows that Lightroom is done a couple of seconds into the task, but the process goes on for around 30-45 seconds more.
I had to recode to and create my own progressscope to get it to show till the task is done.
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