When changing to the presentation mode the side visualization glitches. Same happen when I want to scroll through some pages. Even if the first page looks finde the second one isn't.
With only one side the problem isn't there every time I use the presentation mode. But you can see the visualization glitch for a seconds before it goes back to normal.
MacBook Pro 2019 16"
2,3 GHz 8-Core Intel Core i9
64 GB 2667 MHz DDR4
Intel UHD Graphics 630 / AMD Radeon Pro 5500M
macOS Catalina 10.15.2
InDesign 2020 15.0.1