Comment 1 for bug 414305

I haven't gone through the reproduction steps but I think what's happening is that, because there's no wt in the source, we create the default format (or the default for this bzrdir) in the destination therefore it doesn't work.

One unattractive workaround is to upgrade the working tree after getting it.

It would probably also work to upgrade the hosted branch to 2a; this requires everyone be using 1.17 or preferable 1.18rc1.

I think there's still some kind of general bug here in how we choose the format; it should probably be determined by the branch and repo.