"Slides as a virtual background" does not appear in local recording

I'm trying to use the "slides as a virtual background" feature to record a voice-over on a PowerPoint presentation. In the Zoom app, the feature appears to work as intended (I see my slides and my face superimposed on the slides in the bottom-left corner). However, when I record the meeting to my computer and view the video afterwards, I instead see my face appear in a white box in the upper-right corner of the screen. I would like the video recording to appear as it does in the app: with my face in the bottom-left corner, and the slides as a virtual background.

FWIW, I have experienced this on both Windows and Mac systems, using up-to-date versions of Zoom (6.0.10).

Thank you!