MusicXML import of beams in anacrusis (pickup) measures ignores last beam

Create a musicxml file with an anacrusis measure filed with 8th notes, such as 5 eighth notes in 3/2 as in the example below. Specify the beams for the five eighth notes as [No beam], [Start], [Continue], [Continue], [End]. Expected behavior is a flagged eighth note followed by four beamed eighth notes. Actual behavior is a flagged eighth note followed by 3 beamed eighth notes, ending with a flagged eighth note.

The same behavior exists whether or not a supports tag with beam="yes" appears.

t2.xml and t3.xml below illustrate the same 4-note measure, one as a complete 2/4 measure, and one as the last 4 eighth notes in 5/8. The first is beamed according to the musicxml file. The second is not.