There are duplicated plugin entries in the list of post-build operations (see image)

Configuration:
just started Jenkins 1.414 and installed Hudson Performance Publisher plugin 7.97
when i created a job with free configuration the duplicated plugin entries appeared.

I tried to locate the problem in code and found the following:

• the problem first appeared in 46472e809a877eca6bcf4e70d8a6bfcfea73f443
• the duplicates seem to appear in ExtensionList.ensureLoaded():
  List<ExtensionComponent<T>> r = load();
  r.addAll(legacyInstances); // <- duplicates
  extensions = sort(r);