git cvsimport: new tags not imported on second cvsimport

I made the initial import:
    git cvsimport -d :pserver:user@blackbird:10010/data/cvs/webgui -C SAP -r cvs -k SAP

edited .git/config:
    [cvsimport]
            module = SAP
            r = cvs
            d = :pserver:user@blackbird:10010/data/cvs/webgui

did some commits to CVS and created a new tag

Then ran:
    git cvsimport -ak
To synchronize with CVS.

The new commits were imported, but the new tag wasn't. I made initial import again to another directory and the new tag was in it.