platformViewBackdrop property
Render the backdrop through a live BackdropFilter instead of the shader's captured backdrop.
Set this when the chip floats over a platform view (a map, a camera preview, a video). The premium and standard shaders read their backdrop from a capture, which cannot see a platform view, so over one they render inert. GlassButton already exposes this; without it here a chip has no correct rendering path above a platform view.
Implementation
final bool platformViewBackdrop;