Which "swipe up" feature do you mean? Because Android navigation these days has two or three different swipe up gestures (for app drawer, for recent apps and for "home" if you use the "gesture navigation" option).
With that uncertainty, I wonder whether you had a Google Play Services update? The reason I ask is because I had a notification on my Pixel 2 telling me that there was a services update and that I should restart my phone to install it. I ignored it, but yesterday my phone shut down in use (ageing battery plus cold weather), and after it restarted it broke the recent apps feature on the two-button navigation (Android 9 style) and broke both home and recent apps for the gesture navigation, forcing me to switch to the old three-button style. I'd assumed that this might be Pixel-specific, since recent apps is connected to the stock launcher these days even if you don't use that, and as the stock launcher on a Pixel is Google's Pixel launcher I could easily imaging them breaking it for people who use 3rd party launchers as they have form there, but it might be more widespread. It certainly sounds like it might be something similar to my problem, and the timing is coincidental at least.