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The version of completion script in bash-completion package is outdated and I think the best is to remove it from bash-completion package entirely; and provide better script directly in 'tar' package.
This bug appears to have been reported against 'rawhide' during the Fedora 22 development cycle. Changing version to '22'. More information and reason for this action is here: https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora22
This is solved in bash-completion directly now. There is only small motivation to move this directly into tar package, if there is issue in future, I'll try to help bash-completion maintainer to fix it directly in bash-completion package.