JavaScript error on update.php--pending updates details does't expand

The "X pending updates"details on the core/update.php selection screen doesn't expand due to a JavaScript error:

DrupalBehaviorError: attach ; collapse: settings is undefined
http://d8.dev/core/misc/collapse.js?v=8.0-dev
Line 146

Following is the line in question:
CollapsibleDetails.instances.push(new CollapsibleDetails($collapsibleDetails[i], settings.collapsibleDetails));