Apologies! I pointed to the wrong folder, still completely a good idea to remove scenerycache folder, this is also regenerated on start when it is not present.
The correct repository is right below it. SceneryIndexes. Attached below is a file view of the indexes folder, if you open yours, you will likely have a plethora of files in there that follow the naming convention such as "FIlexxxx" Those are depracated now, and users I've assisted the last few days have all had those files still present, as well as content.xml, which has the same naming conventions as they used to be in that xml, but separated as index files in the SceneryIndexes folder.