In current Java doc, the return value of getCertificateChain is described as follow:

the certificate chain (ordered with the user's certificate first and the root certificate authority last), .....

The correct description should be:

the certificate chain (ordered with the user's certificate first and the root certificate authority's certificate last), ...

the certificate chain (ordered with the user's certificate first and the root CA's certificate last), ...
This is already fixed in tools pages. Not reproducible again.