I have a project with 1 task.  It is a fixed work task that has a WORK of 8 hrs.

I assign it a resource which works 4 hr/day.

I expect the duration to be 2 days.  Instead, the duration is 1 day and the resource is shown as 200% allocated on that day on the resource histogram.

How would I make Project Libre spread that 8 hr task over 2 days as it should?

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As a test I made a new project

I added one task...set it to Fixed Work and set the work to 24hrs.  The task shows a 3day duration