Advanced Preferences are missing first time after start on HIDPI settings

[mdk]

What steps will reproduce the problem?

1. Set Scaling in Advanced Preferences to 2.0 (Read Settings from file scale2.0.xml)
2. Restart JOSM
3. Open Preferences
4. Scroll down (with the mouse wheel) on the left side to "Advanced Preferences"

What is the expected result?

See the table with the Advanced Preferences.

What happens instead?

Only the title is shown. The table is missing.

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

This happns only the first time you try to show the Advanced Preferences. If you change the the preference tab and go back to Advanced Preferences, the table is visible. You could reset the behaviour by restarting JOSM.
I don't know if the reason for this is the scaling or that the Advanced Preferences Icon on the left side is not visible on opening the preferences and maybe the GUI for advanced preferences will be generated when the icon is shown. But selecting the preferences with the mouse wheel didn't trigger the generation of the GUI.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-09-19 20:27:13 +0200 (Sat, 19 Sep 2020)
Revision:17046
Build-Date:2020-09-20 01:30:51
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (17046 en) Linux Ubuntu 20.04.1 LTS
Memory Usage: 442 MB / 1980 MB (146 MB allocated, but free)
Java version: 14.0.1+7-Ubuntu-1ubuntu1, Private Build, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 3840x2160 (scaling 1.0x1.0)
Maximum Screen Size: 3840x2160
Best cursor sizes: 16x16 -> 16x16, 32x32 -> 32x32
Desktop environment: ubuntu:GNOME
Java ATK Wrapper package: libatk-wrapper-java:all-0.37.1-1
libcommons-compress-java: libcommons-compress-java:all-1.19-1
libcommons-logging-java: libcommons-logging-java:all-1.2-2
fonts-noto: fonts-noto:-
VM arguments: [--add-modules=java.scripting,java.sql, -Djosm.restart=true, -Djosm.dir.name=JOSM-latest, -Djava.net.useSystemProxies=true]

Plugins:
+ ColumbusCSV (35405)
+ FastDraw (35499)
+ HouseNumberTaggingTool (35508)
+ OpeningHoursEditor (35414)
+ RoadSigns (35510)
+ SimplifyArea (35405)
+ buildings_tools (35500)
+ contourmerge (v0.1.6)
+ imagery-xml-bounds (35546)
+ imagery_offset_db (35405)
+ pbf (35446)
+ poly (35248)
+ public_transport (35405)
+ reltoolbox (35529)
+ reverter (35499)
+ terracer (35499)
+ turnrestrictions (35515)
+ utilsplugin2 (35487)
+ wikipedia (1.1.4)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/OneClick&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Presets/LaneAttributes&preset&zip=1

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
+ https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&style&zip=1