Roto doesn't update in Prores 4444 + alpha renders

I originally posted this in the Pr forum, because I thought at first that that was the issue. After detective work, it became apparent that it's actually an issue in Media Encoder. The short version: When a comp has the Rotobrush effect on it and is rendered Prores 4444 + alpha through Me... and then later, the same comp has more roto refinements added... when the render is reattempted, Me will NOT render the new roto refinements. Every export of the new improved comp is identical to the original render.

The details and an example: https://community.adobe.com/t5/premiere-pro-discussions/why-doesn-t-pr-reflect-ae-changes-rendered/td-p/15152634 

This affects 2024 versions of the app (I explain why I still am using those in the original post.)

Windows 11