Calendar: Task duration resets to 1 hour after dragging

When dragging a task that has a pre-configured duration into the day view calendar, the task is incorrectly displayed as a 1-hour block regardless of its actual duration. The correct duration is restored only after navigating away from the calendar and returning to it.

Steps to Reproduce:

1. Set a duration for a task in today.

2. Open the Calendar.

3. Drag the task to a time slot.

Expected behavior: The task is displayed with its pre-configured duration.

Actual behavior: The task is displayed as a 1-hour block.

Workaround: Navigating to another view and back to the calendar causes the correct duration to render.