All diagrams I have, show the gable end trusses being omitted (low level fixing) with the emphasis being that the bracing continues to the WP. There is wording in both the TRA (Truss Rafter Association) book and the Alpine Truss Rafter Guide saying that the bracing 'must extend to wall plate'
On raised tie rafters (as we are building at present) such is the emphasis on reaching the wall plate, that they insist you either run the bracing across the face of what will be the internal ceiling (sloped bit) of your roof and then 25mm batten the remainder accordingly, or omit that part of the bracing and use 9mm ply sheathing over the whole of the sloping ceiling, to mitigate.
We opted for the ply. I'm surprised you have not bothered with this important aspect before Woods.