Comment 4 for bug 506777

beuno has fixed his branch by pushing another revision, but I have another at lp:~mbp/convoy/test-stacking that is freshly pushed and can still reproduce this.

I guess this is going to only occur on RemoteBranch, and I suspect that is because it reimplements get_rev_id or something else reached by RevisionSpec_revno. The hpss log is attached.