[BUG] file:serialize does not respect serialization settings

[enury]

Using file:serialize with the option omit-xml-declaration=no does not output the XML declaration <?xml version="1.0" encoding="UTF-8"?> in the serialized files.

However, using the function file:sync does output the declaration.

Example

xquery version "3.1";

import module namespace functx="http://www.functx.com/";
import module namespace file="http://exist-db.org/xquery/file";
import module namespace util="http://exist-db.org/xquery/util";

declare namespace tei = "http://www.tei-c.org/ns/1.0";

(: data :)
let $collection := collection("/db/apps/idp-data-hgv")

(: find files modified since x days :)
let $date := xs:date("2024-03-26")
let $time := xs:time("09:00:00")

for $file in xmldb:find-last-modified-since($collection//tei:TEI, dateTime($date, $time))

(: uri :)
let $uri := base-uri($file)

(: document :)
let $doc := doc($uri)

(: filename :)
let $filename := util:document-name($uri)

(: target path :)
let $targetdir := "C:\Users\nury\Desktop\serialize\"
let $targetpath := concat($targetdir, $filename)

(: parameters :)
let $params := map{
        "omit-xml-declaration":"no",
        "method":"xml"
    }

return 
    file:serialize($doc, $targetpath, $params)

Context

• eXist Version: [6.2.0]
• Java Version: [17.0.7]
• OS: [Windows 10 10.0 amd64]