TCP In node does not like environment variables

When writing a variable name on the TCP In node port, it works as expected but the node shows the little red triangle and a warning is displayed when deploying the flow.
Is this expected behaviour or can I open an issue in Github?
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For information, the TCP Out node behaves graciously when adding an environment variable.

Please open an issue.

Done,

Thank you

Issue fixed and confirmed working in version 3.1.6