How to customize JavaExec command line

Ended up doing something like that below but it doesn’t work with Gradle 6.6 (worked with 6.5.1). Any idea why it doesn’t work with 6.6 ? looks like commandLine only contains the executable now.

@CompileStatic
class ServerJavaExec extends JavaExec {

    private final Property<ExecResult> serverJavaExecResult;

    def serverName

    ServerJavaExec() {
         super()
         serverJavaExecResult = objectFactory.property(ExecResult.class);
    }

    @Override
    @TaskAction
    public void exec() {
        // drop the first item in commandLine, it is the executable (java.exe)
        def javaCommandArgsLine = commandLine.drop(1).join(' ')
        def javaCommand = "cmd /k start \"$serverName\" \"$executable\" $javaCommandArgsLine"

        getLogger().info "Executing $javaCommand ..."
        // >> Here I execute javaCommand, it eventually goes to process builder <<

        // immediately return a success result
        serverJavaExecResult.set([
            exitValue: 0,
            assertNormalExitValue: this,
            rethrowFailure: this
        ] as ExecResult);
    }

    @Override
    public Provider<ExecResult> getExecutionResult() {
       return serverJavaExecResult;
    }
}