Timeline Bar Graph always misses one bar?

I created a timeline with the following five data points:
1 Jan 2001 - 1.0
1 Jan 2002 - 2.0
1 Jan 2003 - 3.0
1 Jan 2004 - 4.0
1 Jan 2005 - 5.0

In line graph and scatter graph modes, the data displays correctly: value 1 at the extreme left and 5 at the extreme right
In bar graph mode, however, only FOUR bars are displayed, showing heights 2, 3, 4 and 5 (see attachment).
The interactive dot that shows when you move the mouse around still shows the value 1 at the extreme left.
In other words, each bar is displayed from the previous date to the current date whose value determines the height.

I would have expected to see FIVE bars, with the CENTER of each bar corresponding to the data point’s date.

Is there any way to make it work like this automatically?
Or do we have to fudge our data so that the dates we supply to the timeline are the midpoints of
the intervals between our actual dates?

attachment included this time
16619.png