Josm doesn't send the changeset comment

[StephaneP]

What steps will reproduce the problem?

1. Do some editing
2. Open the upload window to send the changeset
3. write a changeset comment

What is the expected result?

Josm send the changeset with the comment

What happens instead?

Josm warns me for no changeset comment. If I send the changeset there is no comment.

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

The first changeset without the comment is here ​https://www.openstreetmap.org/changeset/73930545

After Josm sent the changeset without the comment, I've moved only one way, then tried to send the changeset without touching the comment, and it sent....succesfully: ​https://www.openstreetmap.org/changeset/73930576

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2019-08-27 00:41:35 +0200 (Tue, 27 Aug 2019)
Build-Date:2019-08-27 01:30:52
Revision:15323
Relative:URL: ^/trunk

Identification: JOSM/1.5 (15323 en) Windows 10 64-Bit
OS Build number: Windows 10 Pro 1809 (17763)
Memory Usage: 5546 MB / 14564 MB (730 MB allocated, but free)
Java version: 1.8.0_191-b12, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Screen: \Display0 1920x1080, \Display1 2560x1440
Maximum Screen Size: 2560x1440
Dataset consistency test: No problems found

Plugins:
+ DirectUpload (35041)
+ Mapillary (1.5.18)
+ OpeningHoursEditor (34977)
+ PicLayer (35104)
+ PolygonCutOut (v0.7)
+ apache-commons (34908)
+ apache-http (34908)
+ cadastre-fr (34977)
+ changeset-viewer (22)
+ continuosDownload (82)
+ contourmerge (v0.1.4)
+ ejml (35049)
+ geojson (124)
+ geotools (34908)
+ imagery-xml-bounds (35100)
+ javafx-windows
+ jaxb (35014)
+ jna (34908)
+ jts (35064)
+ measurement (35051)
+ opendata (35102)
+ photo_geotagging (34908)
+ photoadjust (34977)
+ poly (34991)
+ reverter (35084)
+ tag2link (35070)
+ tageditor (34977)
+ todo (30306)
+ turnlanes-tagging (281)
+ turnrestrictions (34977)
+ undelete (34977)
+ utilsplugin2 (35098)

Tagging presets:
+ https://raw.githubusercontent.com/yopaseopor/traffic_signs_preset_JOSM/master/FR.zip

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/RecyclingMaterials&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_and_Road_Attributes&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Maxspeed&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Sidewalks&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/MaxspeedIcons&zip=1
- https://raw.githubusercontent.com/species/josm-preset-traffic_sign_direction/master/direction.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/Cycleways&zip=1
- https://github.com/GlassOceanos/indoor-JOSM-style/archive/master.zip
- http://kolesar.turistautak.hu/osm/opencellid/api/styles/measurements.mapcss
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_features&zip=1
- https://josm.openstreetmap.de/josmfile?page=Styles/Lane_features_ryg&zip=1

Last errors/warnings:
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction
- E: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.actions.TagSourceAction