V28 didn't replace V24 overnight. CMS blends the two models over multiple payment years, which means for the duration of the transition your RAF is a weighted mix of two models. If your pipeline treats the switch as a flag flip, your numbers are wrong.
The blend, conceptually
blended_RAF = w_v28 * RAF_v28 + w_v24 * RAF_v24
# w_v28 increases each payment year until V28 is 100%
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