ssjenforcer, I have detected the issue with Jiggle. So it doesn't work in our case in IPR because CentiLeo is doing asynchronous scene evaluation for IPR in a background thread. I have made it for a good reason: to improve the smoothness of modeling and interactive rendering with asynchronous loads. It deals with a scene copy and Cinema 4D has a bug there in some simulation cases. I can get rid of the issue on CentiLeo side if I replace the asynchronous scene evaluation with synchronous, and all the modeling edits will launch as expected but the GUI can have some interruptes in "Auto Scene Update" IPR mode during modeling.
To avoid the issues just in the existing version you can cache the simulation of Jiggle deformer. Just go to the Cache Tab and click "Calculate" there. It will compute all the coordinates for all frames upfront. And next after it these cached coordinates of resulting object will run smoothly with currenct CentiLeo approach.
Actually I was talking once with a simulation plugin developer and he recommended to always use simulation caching during rendering to avoid all sorts of issues, there could be some others too.

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ssjenforcer wrote: I also tried rendering a frame to confirm it wasn't working. And a rendered frame also had no Jiggle deformation

That's probably because you need to render frame by frame from beginning. Not a selected frame. But just use cached simulation, that works well and it's the only solution for deformation motion blur