Motion ND Effect not Rendering in Export with Studio (V.4.9.1)

I guess this is technically a bug report, so I hope I am posting in the right place.

So far I could only get a working Motion ND export with 4K30 timeshift files. The effect in the export seems to be identical to the one shown in the preview.

Speed adjustments are a different story though. When I speed up the videos with Motion ND applied, the generated blur is visible in real time previews, yet the exported videos do not have it at all.

I have tried multiple resolutions and frame rates by the way (4K120, 4K60, 4K30, 8K24 etc.).

Any help and/or comment will be appreciated.