I have had Google Drive add version numbers to files quite recently (the files in question were not Calibre related) so I think the problem still exists.
I suspect that if you only have a single computer connected to Google Drive then you probably get away with using it! The version numbers seem to be related to the syncing process between multiple clients. However the basic advice still has to be to avoid using Google Drive for Calibre Libraries if you do not want unexpected behaviour.
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