Bug: git log: boundary commits do not respect order (e.g. date-order, topo-order) 2

When using git log, boundary commits (ie, those commits added by specifying --boundary) do not respect the order (e.g., --date-order, --topo-order). Consider the following commit history, where number indicates the order of the commit timestamps:

<view with a fixed with font! 3's ancestor is 1, 6's ancestors are 4,5>
0----1----2----5  <--A
       \         \
         3----4----6  <--B

Executing the following command:

$ git log --boundary --date-order ^A B

Should produce the following order (boundary commits shown with dashes): 6 -5 4 3 -1

However, it in fact produces: 6 4 3 -5 -1

Please advise.

Best, ~Josh