A number of the new Posture+Sweep tests use void path expressions, for example A030 uses

<xpath>descendant::document-node()/attribute()</xpath>

Rule 3 for streamability of axis steps (19.8.7.7) says:

If the statically-inferred context item type is such that the axis will always be empty (for example, applying the child axis to a text node or the parent axis to a document node), or if the NodeTest is one that can never select nodes on the chosen axis (for example, selecting attribute nodes on the child axis), then the sweep is motionless and the posture is grounded (because the expression is statically known to return an empty sequence);

In this example both axis steps fall under this rule, so they are both Grounded+Motionless, and therefore (under the rules for path expressions in 19.8.7.6) the path expression as a whole is Grounded+Motionless. The expected result of the test case is given as Climbing+Consuming. 

There are other tests where only one of the axis steps is void under this rule, for example

<xpath>descendant-or-self::foo/namespace::attribute()</xpath>

In this case I believe the spec gives the result as Grounded+Consuming, which is reasonable enough. Saxon is smarter, and computes the result as Grounded+Motionless, because it has already worked out that the entire path expression is void. The expected result in the test case, however, is Climbing+Consuming.