Custom CLI option in variablesResolutionMode: "20210326" error?


I’m using the last version of sls (‘2.51.0’) with the mode variablesResolutionMode: "20210326", when I use a custom cli option (e.g.: ${opt:test}), I have an error for this cli cmd: sls package --test toto

The error:
Value not found at "opt" source

Is it normal or a bug in the ‘20210326’ mode ?

Thank you