Impress won't let me return to a previous slide from a downloaded .pptx file

I’ve downloaded a Powerpoint file with which to make a Jeopardy game, but the function to return to the main slide isn’t working. I’ve tried creating an empty macro and setting the macro security to low (temporarily), but neither of these did anything. Whenever I click the button to return the main slide, either nothing happens, or I get the following pop-up:

Clicking “OK” doesn’t do anything. I’ve even tried with a different Jeopardy template, and I get the same problem - it seems to be something dealing with the “return to a previous slide” functionality, in particular. Any ideas would be appreciated!

System info:
Kubuntu 22.04.4
LibreOffice Impress flatpak 24.8

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