In https://gerrit.wikimedia.org/r/c/mediawiki/extensions/SecurePoll/+/709247 I added the following dirty hack, which hard-coded the wikis without securepoll to the codebase.
// TODO: Implement this properly and get rid of this hack // SecurePoll is not installed on these if ( $dbname == 'labtestwiki' || $dbname == 'labswiki' || $dbname == 'loginwiki' ) { continue; }
It was added ~36 hours before the scheduled start of the election (it was later delayed) in order to fix T287780#7250890.
A proper fix should be implemented.