Thank you for your reply， I delete all the old version and use your way to deploy，the build number and snapshots’ timestamp is right , but , the build number in the metadata.xml is still 4, I guess the metadata.xml do not delete completely，no matter how I delete the assets or deploy，The contents of the meatadata.xml is never updated.
but if I change the artifactId or groupId，such as , I change artifactid xxx to yyy，the metadata.xml is updated, and other snapshots assets is work normally, only this one when use origin artifactId and groupId,the metadata.xml not update。
so , is this a bug?