Because it's waiting for webTaskboxService for some reason, which is provided by the ui-common bundle.
Error rendering 'com.meetme.plugins.jira.gerrit-plugin:gerritreviewsmodule'. Please contact your JIRA administrators.
needs to be reevaluated
OK it's still there. Reproduce:
--> ui-admin-bundle is not restarted (does not use updated classes)
--> bundle gets stuck in grace-period