vB 5.0.0 Beta is public now. Making this issue public.
Please do NOT upgrade to vBulletin 5 if you are using VaultWiki 3. vBulletin 5 is not compatible with mods from previous versions.
The earliest version of VaultWiki that will be compatible with vBulletin 5 is VaultWiki 4 (specific Alpha/Beta not yet determined).