Comment 1 for bug 1685928

It works fine here. I can't reproduce the issue here. (There is an issue when no argfile is specified in the preferences. This is fixed in the repository now.)
If you specify an empty argfile, then no tags are copied. This should be clear.
Go the preferences, delete the filename for the argfile and then press "Edit". This will ask for a new filename and create a default argfile and try with it.
(Maybe in PTBatcherGUI activate the options always save log and try again. At the end of the log it should read
Updating metadata...
    1 image files updated
The option use exiftool should be activated in settings.)
Please report what you get.

PS: XMP GPano tags are only created for equirectangluar output.