VaultWiki 4 does not provide a Redirect BB-Code. If you have one in your BB-Code Manager, it should be removed.
For the Book BB-Code, this would only be used if you actually had a Book prefix in VW3. If you don't, it should be removed now.
For any wiki BB-Code, the wiki icon location will only be used if the "Wiki-Related Options" setting "Place BB-Code in the Wiki Code group?" is used. This is consistent with VW3 behavior.