One-day work packages are impossible because they are displayed as milestones.

[ncouvert]

Actual

If a workpackage lasts one day, it is transformed into a milestone. Therefore, it is impossible for a workpackage to have a duration of one day.

Moreover, there is a difference between the end date displayed in the Details view and the one shown in the Gantt view

1. Initial workpackage

2. During edition

3. The one-day workpackage is transformed to a milestone

Expected

It should be possible to display a one-day workpackage. One solution would be to add a toggle button to transform a workpackage into a milestone.
The dates displayed should be consistent across all views.