option --load-preferences don't work

[battarsa]

What steps will reproduce the problem?

1. Create a copy of preferences.xml (ex. preferences.ohm)
2. Edit preferences.ohm to change some config (ex. I change the server url to point to OpenHistoricalMap)
3. Start josm with option --load-preferences=.josm/preferences.ohm

What is the expected result?

If I go to preferences I expect to find OpenHistoricalMap url

What happens instead?

If I go to preferences I find standard OpenStreetMap url

Please provide any additional information below. Attach a screenshot if possible.

At startup the following debug line is printed on console:
Reading preferences from file:/home/user/.josm/preferences.ohm

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2024-04-29 18:37:36 +0200 (Mon, 29 Apr 2024)
Revision:19067
Build-Date:2024-05-02 01:31:13
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19067 it) Linux Debian GNU/Linux trixie/sid
Memory Usage: 408 MB / 3736 MB (46 MB allocated, but free)
Java version: 17.0.11+9-Debian-1, Debian, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 1920×1080 (scaling 1.00×1.00) :0.1 1280×1024 (scaling 1.00×1.00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: it_IT.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: it_IT
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: KDE
Java package: openjdk-17-jre:amd64-17.0.11+9-1
Java ATK Wrapper package: libatk-wrapper-java:all-0.40.0-3
libcommons-compress-java: libcommons-compress-java:all-1.25.0-1
libcommons-logging-java: libcommons-logging-java:all-1.3.0-1
fonts-noto: fonts-noto:all-20201225-2
VM arguments: [--module-path=/usr/share/openjfx/lib, --add-modules=java.scripting,java.sql,javafx.controls,javafx.media,javafx.swing,javafx.web, -Djosm.restart=true, -Djava.net.useSystemProxies=true, --add-exports=java.base/sun.security.action=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED]
Program arguments: [--load-preferences=.josm/preferences.ohm]

Plugins:
+ FastDraw (36226)
+ FixAddresses (36258)
+ OpeningHoursEditor (36258)
+ PicLayer (1.0.3)
+ apache-commons (36176)
+ ejml (36176)
+ geotools (36176)
+ imagery_offset_db (36226)
+ jackson (36176)
+ jaxb (36118)
+ jts (36004)
+ opendata (36256)
+ reverter (36256)
+ shrinkwrap (v1.1.1)
+ turnrestrictions (36226)
+ undelete (36226)
+ utilsplugin2 (36241)

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_Streets&zip=1
- https://github.com/bastik/mapcss-tools/raw/osm/mapnik2mapcss/osm-results/mapnik.zip
- https://josm.openstreetmap.de/josmfile?page=Styles/Noname&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Cycleways&zip=1
- https://www.dropbox.com/s/qo3ai47fpv241jf/Styles_Fixme_and_Notes.zip?raw=1
- https://josm.openstreetmap.de/josmfile?page=Styles/LayerChecker&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Surface&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/PublicTransportV2&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/LitObjects&zip=1

Validator rules:
+ https://josm.openstreetmap.de/josmfile?page=Rules/ItalySpecific&zip=1

Last errors/warnings:
- 00012.965 E: Invalid setting (Icon missing): org.openstreetmap.josm.plugins.fixAddresses.FixAddressesPreferences

[taylor.smock]

The format of the preferences file for --load-preferences is not the same as the JOSM preference file.

Please look at wiki:Help/Preferences/ImportExport for details on the file format.