small mitigation to generation loss

[jyrkialakuijala]

Before:

Encoding      kPixels    Bytes          BPP  E MP/s  D MP/s     Max norm  SSIMULACRA2   PSNR        pnorm       BPP*pnorm   QABPP   Bugs
----------------------------------------------------------------------------------------------------------------------------------------
jxl:d0.1        20315 17771024    6.9979205   1.083  10.777   0.35756577  95.39413774  55.88   0.11792287  0.825214859523   6.998      0
jxl:d0.5        20315  7252143    2.8557679   1.284  15.072   0.78009917  91.43862540  47.13   0.33393541  0.953642033483   2.944      0
jxl:d0.8        20315  5367111    2.1134751   1.174  15.958   1.11498186  88.72067125  44.51   0.47189587  0.997340150865   2.494      0
jxl:d1          20315  4606615    1.8140049   1.198  16.140   1.33978720  86.93643661  43.28   0.56051359  1.016774427528   2.535      0
jxl:d1.5        20315  3495106    1.3763120   1.171  15.575   1.86243967  82.75276197  41.14   0.76111748  1.047535130323   2.673      0
jxl:d2.0        20315  2841131    1.1187880   1.219  16.153   2.39270883  78.72248340  39.64   0.95068901  1.063619476080   2.823      0
jxl:d2.5        20315  2391176    0.9416036   1.230  16.769   2.85363662  74.90745005  38.44   1.12566896  1.059933899631   2.821      0
jxl:d3          20315  2084298    0.8207603   1.169  16.651   3.27099277  71.57564628  37.60   1.28291115  1.052962585207   2.801      0
jxl:d5          20315  1396215    0.5498052   1.175  11.051   4.60528606  60.08180640  35.30   1.81269081  0.996626849726   2.631      0
jxl:d10         20315   841857    0.3315087   1.176  12.008   7.65826483  38.55099789  32.51   2.92552904  0.969838209567   2.531      0
Aggregate:      20315  3363578    1.3245185   1.187  14.425   1.89943602  74.74511614  41.09   0.75185110  0.995840722234   2.960      0

After:

Encoding      kPixels    Bytes          BPP  E MP/s  D MP/s     Max norm  SSIMULACRA2   PSNR        pnorm       BPP*pnorm   QABPP   Bugs
----------------------------------------------------------------------------------------------------------------------------------------
jxl:d0.1        20315 17761428    6.9941417   1.088  10.373   0.37916528  95.36591800  55.68   0.12283972  0.859158381583   7.005      0
jxl:d0.5        20315  7251498    2.8555139   1.289  14.710   0.78100335  91.41954234  47.05   0.33682722  0.961814828199   2.947      0
jxl:d0.8        20315  5366227    2.1131270   1.147  15.518   1.11995568  88.71451499  44.44   0.47440386  1.002475591982   2.515      0
jxl:d1          20315  4608969    1.8149319   1.180  15.735   1.34639039  86.91796500  43.21   0.56286419  1.021560177728   2.553      0
jxl:d1.5        20315  3495593    1.3765038   1.195  15.282   1.87061299  82.78818921  41.11   0.76214781  1.049099345986   2.692      0
jxl:d2.0        20315  2840283    1.1184541   1.212  16.396   2.40535166  78.72082266  39.61   0.95064106  1.063248387636   2.834      0
jxl:d2.5        20315  2393402    0.9424801   1.221  16.447   2.82957458  74.96202446  38.43   1.12568196  1.060932870364   2.796      0
jxl:d3          20315  2083132    0.8203012   1.153  16.441   3.30351524  71.62156476  37.58   1.28400911  1.053274199013   2.830      0
jxl:d5          20315  1395491    0.5495201   1.163  10.917   4.60184604  60.11060514  35.29   1.81288944  0.996219205234   2.631      0
jxl:d10         20315   844552    0.3325699   1.150  11.696   7.61907974  38.76179965  32.52   2.91778089  0.970366109616   2.525      0
Aggregate:      20315  3364455    1.3248638   1.179  14.152   1.91361598  74.79687648  41.05   0.75626872  1.001953044402   2.969      0

Description

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[jyrkialakuijala]

I have a better fix -- I'm abandoning this one.