OCLP, Metal & PowerPoint

Sorry if this is off-topic. I'm trying to edit a PowerPoint presentation on an OCLP'd 2011 MBP running Monterey. The problem is that the 3D models don't load. They do load on a 2012 iMac running the same version of PowerPoint and Monterey.

Could it be because of the lack of Metal?

Do you think if i downgrade to the last supported macOS (High Sierra 10.13.6) it would work? According to Microsoft: "3D models in Microsoft 365 for Mac, Office 2024 for Mac, and Office 2021 for Mac are supported on macOS version 10.12 and on macOS version 10.13.4 and later.", but it would still be the same Mac so i don't know

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