The page previews feature should be disabled on the following special pages using the config variable added in T170169
https://en.wikipedia.org/wiki/Special:CreateAccount
https://en.wikipedia.org/wiki/Special:GlobalRenameRequest
https://en.wikipedia.org/wiki/Special:UserLogin
https://en.wikipedia.org/wiki/Special:MergeAccount
https://en.wikipedia.org/wiki/Special:ChangeCredentials
https://en.wikipedia.org/wiki/Special:OAuthListConsumers
https://en.wikipedia.org/wiki/Special:GlobalUserRights
https://en.wikipedia.org/wiki/Special:Notifications
https://en.wikipedia.org/wiki/Special:UserRights
https://en.wikipedia.org/wiki/Special:Upload
https://en.wikipedia.org/wiki/Special:VipsTest
https://en.wikipedia.org/wiki/Special:ApiFeatureUsage
https://en.wikipedia.org/wiki/Special:ExpandTemplates
https://en.wikipedia.org/wiki/Special:GadgetUsage
https://en.wikipedia.org/wiki/Special:GraphSandbox
https://en.wikipedia.org/wiki/Special:TemplateSandbox
https://en.wikipedia.org/wiki/Special:MostLinkedFiles
https://en.wikipedia.org/wiki/Special:Book
https://en.wikipedia.org/wiki/Special:CiteThisPage