Okay, so… I turned on my computer this morning and everything just works again. I’ll do my best to address why:
Can’t Resolve Unreal Engine Symbols
If you just reinstalled the engine or the IDE and have this issue, try restarting your computer. I don’t know for certain that this is what fixed it, but that’s my best guess.
RiderLink Plugin Failed to Build
If you’re using UE5.1 or 5.2, make sure you have Rider v.2023.1 (I recommend sticking with stable releases and ignoring the EAP versions). Then, go inside of Rider and update the UnrealLink plugin. UE5.1 and 5.2 handle the Unreal Build Tool very differently than previous versions of the engine, and older versions of Rider and the UnrealLink plugin can’t work with the new system, so they have to be up to date first.
I really hope this helps people in the future. I know my answer for the “can’t resolve symbols” error wasn’t overly helpful, but I honestly don’t know for sure how I fixed it.