From what I can tell, the screen itself is fine, but the pins on the connectors are what ended up being the problem. Got a new screen and everything works perfectly. The pins on the cables seem overly delicate, so keep that in mind when re-assembling.
So, in short, '''if you run into a screen issue when putting your Pixel 2 XL back together, you will likely need a new screen''' unless you know how to find bent/broken pins and repair them.