DSU, do you have a OnePlus N10 or N20? It does not work. If it works on your OnePlus, please provide the extra/special steps you took other than tapping the app and selecting a gsi, then rebooting. Nothing happens on boot. No gsi. Just boots normally.
It's part of the never ending death march of every decent Google product.
First it's a name change, then they'll tweak a core functionality so it's really really helpful, then they'll either kill it immediately or move it into another package (thus fracturing older apps and devices from the functionality completely), then they pay wall it or kill it abruptly.
Been using Series Guide for years. Love it.