There two bugs present when using photon noise combined with lossy progressive. First of all, photon noise seems be applied to the LF and the HF. This is causing a LF blurry noise texture to be present. This only happens with VarDCT when using --photon_noise_iso and -p. It also happens with --photon_noise_iso and -progressive_dc. None of the other progressive flags, --progressive_ac and --qprogressive_ac trigger this bug.

Another issue found is that for VarDCT, photon noise is much much stronger when used with progressive, likely meaning it's being applied multiple times over. A major condition to trigger this bug is that the image has to be larger than 2048x2048, implying chunked encoding must be at play here. For lossy modular, it's always stronger regardless if progressive is specified or not.