Attempt at upload freezes JOSM and is forced to end by killing task

[nimbinOSM]

What steps will reproduce the problem?

1. Using version 17580 on Windows 10 modify road tags and adding sidewalks to Vejlby Centervej in Aarhus, Denmark.
2. After finishing the edits I click upload which freezes the entire JOSM entirely.
3. Is forced to close JSOM using Task manager.

What is the expected result?

That it didn't freeze and simply uploaded the changes.

What happens instead?

JSOM freezes completely making any further interactions impossible.

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: 2021-03-17 18:58:40 +0100 (Wed, 17 Mar 2021)
Build-Date:2021-03-17 17:59:56
Revision:17580
Relative:URL: ^/trunk

Identification: JOSM/1.5 (17580 en) Windows 10 64-Bit
OS Build number: Windows 10 Home 2009 (19042)
Memory Usage: 408 MB / 1820 MB (315 MB allocated, but free)
Java version: 1.8.0_281-b09, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 3440×1440 (scaling 1.00×1.00) \Display1 1440×2560 (scaling 1.00×1.00)
Maximum Screen Size: 3440×2560
Best cursor sizes: 16×16→32×32, 32×32→32×32

Plugins:
+ CustomizePublicTransportStop (35640)
+ ImproveOsm (206)
+ imagery_offset_db (35640)
+ pt_assistant (2.1.10-80-g7d9bba3)
+ public_transport (35640)
+ turnrestrictions (35640)

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

[GerdP]

How long did you wait? Was the CPU busy? It is possible that the validation process takes longer and there is no progress bar to indicate this.