Orphaned building parts for building:parts inside relations

[Nadjita]

What steps will reproduce the problem?

1. Create a building-relation where one building:part is not inside the building-outline-way (e.g. larger underground part, or overhanging non-groundfloor parts), but member of a building-relation.
2. Verify/Upload

What is the expected result?

No errors/warnings, because the building-relation is used to group building:parts.

What happens instead?

A warning saying "Orphaned building part", even though it's not orphaned, it's connected via the building-relation.

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

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2025-08-31 14:19:57 +0200 (Sun, 31 Aug 2025)
Revision:19439
Build-Date:2025-09-02 01:30:58
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19439 en) Linux Fedora Linux 43 (KDE Plasma Desktop Edition)
Memory Usage: 1696 MB / 16384 MB (870 MB allocated, but free)
Java version: 25.0.1+8, Red Hat, Inc., OpenJDK 64-Bit Server VM
Look and Feel: com.formdev.flatlaf.FlatIntelliJLaf
Screen: :0.0 1920x1200x[Multi depth]@75Hz (scaling 1.00×1.00) :0.1 1920x1200x[Multi depth]@[Unknown refresh rate] (scaling 1.00×1.00)
Maximum Screen Size: 1920×1200
Best cursor sizes: 16×16→16×16, 32×32→32×32
Environment variable LANG: en_GB.UTF-8
System property file.encoding: UTF-8
System property sun.jnu.encoding: UTF-8
Locale info: en_US
Numbers with default locale: 1234567890 -> 1234567890
Desktop environment: KDE
VM arguments: [--module-path=/usr/lib/jvm/openjfx, --add-modules=java.scripting,java.sql,javafx.controls,javafx.media,javafx.swing,javafx.web, --add-exports=java.base/sun.security.action=ALL-UNNAMED, --add-exports=java.desktop/com.apple.eawt=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=javafx.graphics/com.sun.javafx.application=ALL-UNNAMED, --add-exports=jdk.deploy/com.sun.deploy.config=ALL-UNNAMED, --add-opens=java.base/java.lang=ALL-UNNAMED, --add-opens=java.base/java.nio=ALL-UNNAMED, --add-opens=java.base/jdk.internal.loader=ALL-UNNAMED, --add-opens=java.base/jdk.internal.ref=ALL-UNNAMED, --add-opens=java.desktop/javax.imageio.spi=ALL-UNNAMED, --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED, --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED, --add-opens=java.base/sun.security.action=ALL-UNNAMED, -Djava.util.Arrays.useLegacyMergeSort=true, -Dawt.useSystemAAFontSettings=on]
Dataset consistency test: No problems found

Plugins:
+ CommandLine (36438)
+ HouseNumberTaggingTool (36438)
+ KindaHackedInUtils (1764889965)
+ OpeningHoursEditor (36438)
+ PicLayer (269)
+ RoadSigns (36438)
+ ShapeTools (e2b1469)
+ SimplifyArea (36438)
+ apache-commons (36438)
+ buildings_tools (36438)
+ easypresets (1623509627)
+ ejml (36438)
+ flatlaf (36438)
+ geotools (36438)
+ indoorequal (0.0.7)
+ jackson (36438)
+ jaxb (36438)
+ jts (36438)
+ measurement (36438)
+ opendata (36460)
+ openqa (116)
+ pbf (36438)
+ reverter (36447)
+ sidewalks (71)
+ terracer (36438)
+ turnrestrictions (36458)
+ urbaneye3d (1.6.1)
+ utilsplugin2 (36438)
+ zzbuildings (eb88a9b)

Tagging presets:
+ <josm.pref>/EasyPresets.xml
+ https://josm.openstreetmap.de/josmfile?page=Presets/Crafts&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/contact(socialnetworks_IMs)&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Healthcare&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/pedestrian_crossings_in_DE&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/public_bookcase&zip=1
+ https://osmtools.de/josm/steps.xml
+ https://raw.githubusercontent.com/yopaseopor/traffic_signs_preset_JOSM/master/DE.zip
+ https://josm.openstreetmap.de/josmfile?page=Presets/Wikidata&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/ParkingLanes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Simple_Indoor_Tagging&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/Heritage&zip=1

Map paint styles:
- <josm.pref>/plugins/indoorhelper/resources/sit.mapcss
+ https://josm.openstreetmap.de/josmfile?page=Styles/Potlatch2&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Enhanced_Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
+ https://raw.githubusercontent.com/yopaseopor/traffic_signs_style_JOSM/master/DE.zip
+ https://josm.openstreetmap.de/josmfile?page=Styles/Coloured_buildings&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/LitObjects&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/BesideTheRoad_Speed&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/SidewalksAndFootways&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/SimpleBuildingTags&zip=1
+ ${HOME}/Sync/josm-styles/landuses.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/TreeCrownDiameter&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/ParkingLanes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/Incline&zip=1
+ ${HOME}/Sync/josm-styles/marks-buildings.mapcss
- https://raw.githubusercontent.com/yopaseopor/indoormap/master/indoormap-style.mapcss

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

Last errors/warnings:
- 00007.936 E: Failed to locate image 'traffic_signs/DE/DE_315-66.svg'
- 00007.936 W:  DE:315-66: Could not get presets icon traffic_signs/DE/DE_315-66.svg
- 00007.938 E: Failed to locate image 'traffic_signs/DE/DE_315-67.svg'
- 00007.938 W:  DE:315-67: Could not get presets icon traffic_signs/DE/DE_315-67.svg
- 00007.958 E: Failed to locate image 'traffic_signs/DE/DE_315-88.svg'
- 00007.959 W:  DE:315-88: Could not get presets icon traffic_signs/DE/DE_315-88.svg
- 00221.542 E: Failed to locate image 'reset_camera'
- 00221.588 E: Failed to locate image 'mapmode/presets/transport/way/way_pedestrian.svg'
- 04332.122 W: Unable to convert property object-z-index to type class java.lang.Float: found RelativeFloat{val=1.0} of type class org.openstreetmap.josm.gui.mappaint.mapcss.Instruction$RelativeFloat!
- 04332.123 W: Unable to convert property object-z-index to type class java.lang.Float: found RelativeFloat{val=1.0} of type class org.openstreetmap.josm.gui.mappaint.mapcss.Instruction$RelativeFloat!