Yarn upgrade-interactive in the current workspace

[cgx-system]

Hi,
I desperatly find a way to upgrade interactively all packages in a specific workspace.
According to the documentation, the yarn workspace <workspace> <subcommand> is supposed to run the subcommand inside the selected workspace, but this doesn't work with upgrade-interactive. It upgrades the packages for all workspaces at once !
What am I missing ?
Thanks.