bcvk to-disk fails on containers-storage: prefix

[jlebon]

$ bcvk to-disk containers-storage:quay.io/fedora/fedora-bootc out.qcow2 --format=qcow2 --filesystem xfs
Connected (5 seconds elapsed), beginning installation...
Setting up temporary filesystems...
Starting bootc installation...
Source image: containers-storage:containers-storage:quay.io/fedora/fedora-bootc
Additional args: --filesystem xfs
Error: parsing named reference "containers-storage:quay.io/fedora/fedora-bootc": invalid reference format
Error:
   0: SSH installation command failed with exit code: Some(125)

Location:
   crates/kit/src/to_disk.rs:551

Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.

That seems inconsistent with other commands I've tried. The VM spawning layer clearly handles it well, but I think it needs to be peeled off before passing to bootc install to-disk?