Update 31.10 appears to have broken a lot of the functionality in my creative map

hi @BattlePanda68
Looking at your errors the way to solve this is to verify the project and repair any damaged false anti-virus reports that have caused critical UEFN files to be isolated.
see post
urc.exe and urc.dll get flagged as Malware from Microsoft Defender

Now look on the content server and see if your project is broken?

check here
UEFN - Content Service (epicgames.com)

backup and restore your to a new location of the project
follow
How to copy a UEFN project - Development / Getting Started & Setup - Epic Developer Community Forums (unrealengine.com)

Now change the new directory of the restored project, Add an “s”,
So its name is “Projectnames” or anything you like

now go into the new directory name
rename ProjectName.uefnproject to ProjectNameS.uefnproject

Go into verified UEFN and Browse for the project in “Projectnames” and the file ProjectNameS.uefnproject.
Create a new UFEN project and this should work because this will create a new project on the content server.

No idea why your project is broken or how to fix it!.