This came up in another thread with a workaround The built-in proxies don't work properly with time-remapped clips. There's a way to do it though ... In the Project panel, select the original clip/s that have been interpreted (time change) and need proxies Right-click, Proxies/create proxies; AME will launch, switch to that app immediately and ... Stop the encoding process in AME before it finishes, and select that clip then right-click "Reset Status" Select (all clips, if working a number of them), right-click and select "Interpret footage" setting the timebase to that of the modified originals; click the go-ahead arrow to process the proxies; when complete, all but the stopped/reset clip will show in PrPro as "attached" in the PrPro Project panel. For the clip that was stopped/reset, right-click on the original media clip/s in PrPro, right-click, "Proxies/Attach Proxies" Select the clip, then navigate to where the proxies are stored on disc, select, "attach" and voila.
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