"bzr git-import" and multiple branches

[Eli Zaretskii]

Previously, "bzr git-import" would create all the branches, but
without trees, so one needed to "bzr co" in any branch for which one
wanted to have a tree.

But in bzr 2.5.0, no directories are created, and "bzr co" seems to
checkout a single branch (which one?).

I thought perhaps the branches are colocated, but "bzr switch" refuses
to switch to a named branch:

  D:\gnu\bzr\gawk-branches>bzr switch gawk-stable
  bzr: ERROR: Cannot switch a branch, only a checkout.

What am I missing?  How do I checkout several branches in a repository
created by git-import?

TIA