Fortnite Blueprints disable World Position Offset

We’re using a WPO shader to animate a fade in on our props based on camera height, this is fully working on our Static Mesh and a standard Actor Blueprint, however any of the Fortnite Blueprints causes WPO to be disabled.

We’re forced into using BP FortProp to spawn actors via verse. Why is WPO being silently disabled on these blueprints when they work fine using ES3.1 and other low end shader models?

Thank you for your report! We would like to look into this further, would you be able to submit a bug report using the form available here: Fortnite Creative