cargo pgrx upgrade doesn't do workspaces

[workingjubilee]

A common, recommended pattern for using pgrx, is a workspace like this:

[workspace]
members = [
    "rust-library",
    "pgrx-extension", # exposes rust-library as an extension
]

I ran

cd workspace-repo
cargo pgrx upgrade --to 0.12.0-beta.5

It did not produce a git diff, but when I added these commands, it did:

cd pgrx-extension # so, at this point, cd workspace-repo/pgrx-extension
cargo pgrx upgrade --to 0.12.0-beta.5

I would expect these two to have the same result in the event of this pattern.