Duplicate stage option being passed to 'sls package'

I've made a hello-world repo of the issue with error logs and explanation here: https://github.com/mdial89f/double-stage-issue

What's broken?

When calling sls service-a:package --stage mystage from the compose level, an error is thrown due to a duplicate stage parameter being passed to service-a.

xxxxx@xxxxxxxxx double-stage-issue % serverless service-a:package --stage mystage --verbose
service-a › Invoking "package" on service "service-a"
service-a › Running "serverless package --stage=mystage --verbose --stage mystage"
Environment: darwin, node 14.18.3, framework 3.15.2 (local), plugin 6.2.2, SDK 4.3.2
Docs:        docs.serverless.com
Support:     forum.serverless.com
Bugs:        github.com/serverless/serverless/issues

Error:
Unexpected multiple "--stage"
Error:

Verbose logs are available in ".serverless/compose.log"

Note the invoked command above contains both "--stage mystage" and "--stage=mystage".

Please see README here for folder structure and error.

What's the impact of this bug?

You can't run 'sls package' against a particular service from the compose level.
I hit this while trying to get my custom plugin command to work. I see that passing cli options to a plugin's command is still TODO, but I felt this falls outside that TODO, as it's the 'package' command and it's not failing from lack of passed options.

Steps to Reproduce?

Please see README here for exact reproduction steps.

in short:

sls service-a:package --stage mystage

Assorted Notes/Considerations

I put this in the helper repo's README, but deleting the stage from opts before invoking the sub command "fixes" this, but I doubt that's the right choice.
I'm suspicious that I'm missing something, and this is all intended. Any help appreciated!!

serverless / compose