Lightroom Classic reads `ToneCurvePV2012Red/Green/Blue` only together with `ToneCurvePV2012`: a packet with a channel curve and no master curve leaves the photo unchanged there (rendered on a chart: the channel curve alone has no effect, with an identity master curve it applies). Imports now do the same. The preset-packet test helper uses made-up as-shot values. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>