All leaf blocks and scaffolding render without face dimming in 1.21.40 on my computer (Ryzen 5 5600x, NVIDIA RTX 3080). This was not an issue on 1.21.30.25 or prior.

Expected Result
Leaves and scaffolding use their normal face dimming.

Observed Result
Leaves and scaffolding render without face dimming up to the edge of the simulation distance, as if their "brightness_gamma" value is set to 0 in blocks.json.