Why will the 777X be tested for crosswind handling with wingtips raised? Wikipedia says:

As existing regulations do not cover the folding wingtips, the FAA issued special conditions, including proving their load-carrying limits, demonstrating their handling qualities in a crosswind when raised

Why?
Especially when this question says:

The 777X family (777-8/-9/-10) features wingtips that fold up on the ground to let the aircraft fit in tight spaces. These have to be extended and locked in place before a revenue flight can take place,

So, what is the point of certifying the 777X for wingtip up flight? I haven't found a reason for this in Wikipedia either. Is it for ferry flights or something?
If you read the details in the Federal Register, you can see that this refers to crosswind handling on the ground, not in the air:

The folding wingtips and their operating mechanism must be designed
for 65 knot, horizontal, ground-gust conditions in any direction as
specified in § 25.415(a). Relevant design conditions must be defined
using combinations of steady wind and taxi speeds determined by
rational analysis utilizing airport wind data.

And:

The airplane must demonstrate acceptable handling qualities during
rollout in a crosswind environment, as wingtips transition from the
flight-deployed to folded position, as well as during the unlikely
event of asymmetric wingtip folding.