shell : is syntax checking via option -n really working ?

Hello,
as I ckeck a script via 'sh -n <file>' I receive the syntax error

listserver.tcl: 31: Syntax error: "else" unexpected (expecting "then")

However syntax looks good and script execution is fine. Please find attached file for more details. Is there anything weird with 'sh -n' behaviour ? Or anything else ?

Thanks for attention.

Regards,
Bruno

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