Multiple images displayed from restored session file

[motogs]

What steps will reproduce the problem?

1. Restoring a *.joz session file
2. Clicking on any geo-located image icon created in JOSM from a *.gpx file containing image references created by OSMTracker

What is the expected result?

Only one image will be displayed.

What happens instead?

Double the number from the previous session are displayed. I'm currently up to 16 for one click on any icon on one session.

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

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-04-27 20:35:33 +0200 (Tue, 27 Apr 2021)
Build-Date:2021-04-27 21:58:39
Revision:17833
Relative:URL: ^/trunk

Identification: JOSM/1.5 (17833 en_GB) Windows XP 32-Bit
OS Build number: Microsoft Windows XP (1.511.1 () (Obsolete data - do not use))
Memory Usage: 247 MB / 989 MB (86 MB allocated, but free)
Java version: 1.8.0_151-b12, Oracle Corporation, Java HotSpot(TM) Client VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920×1080 (scaling 1.00×1.00)
Maximum Screen Size: 1920×1080
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: Cp1252
System property sun.jnu.encoding: Cp1252
Locale info: en_GB
Numbers with default locale: 1234567890 -> 1234567890

Plugins:
+ HouseNumberTaggingTool (35640)
+ apache-commons (35524)
+ apache-http (35589)
+ buildings_tools (35669)
+ ejml (35458)
+ geotools (35458)
+ javafx-windows (35655)
+ jaxb (35543)
+ jna (35662)
+ jts (35458)
+ mapathoner (1.1.7)
+ markseen (14)
+ measurement (35640)
+ opendata (35640)
+ openjfx
+ print (35640)
+ reltoolbox (35640)
+ rex (53)
+ terracer (35640)
+ turnrestrictions (35640)
+ undelete (35640)
+ utilsplugin2 (35691)

Last errors/warnings:
- 00009.117 E: java.lang.IllegalStateException: Error adding certificate AC RAIZ FNMT-RCM - certificate fingerprint mismatch. Expected ebc5570c29018c4d67b1aa127baf12f703b4611ebc17b7dab5573894179b93fa, was 4d9ebb28825c9643ab15d54e5f9614f13cb3e95de3cf4eac971301f320f9226e
- 00009.347 W: Missing plugin main version in plugin microdata_scraping
- 00009.832 W: Missing plugin main version in plugin microdata_scraping
- 00010.076 W: Plugin openjfx requires Java version 11. The current Java version is 8. You have to update Java in order to use this plugin.

[motogs]

A *.joz file exhibiting the described behaviour