I also use the Navigraph nav data.
On the runways 09s I can see the BIG transition, but not on 27s. I suppose there is something wrong in how the BIG transition is read by EFB (or wrote by Navigraph, not sure where is the problem).
If I remember correctly, when it was released, also the FSLabs A320 was not showing the BIG transition, then the issue disappeared, but I do not know if it was on FSLabs or Navigraph side.