Duplicate node autofix fails silently

[zelonewolf@…]

What steps will reproduce the problem?

1. Go to File->Download Object
2. Download way 852236340
3. Repeat this for way 856973532
4. Press validate
5. Click "Natural Duplicated Nodes (17)" and press Fix
6. Press validate again

What is the expected result?

Duplicated nodes are fixed

What happens instead?

Duplicated nodes are not fixed, and running the validator again still returns the duplicate nodes.

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

Duplicated node fixes DO work when data is downloaded from the slippymap. However, if data is downloaded by direct object ID download, or via an overpass query, duplicated node auto-fixes do not work.

A Ctrl+Alt+D (download referrers) does not fix the issue.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-10-03 13:42:38 +0200 (Sat, 03 Oct 2020)
Build-Date:2020-10-04 01:30:47
Revision:17084
Relative:URL: ^/trunk

Identification: JOSM/1.5 (17084 en) Windows 10 64-Bit
OS Build number: Windows 10 Home 1903 (18362)
Memory Usage: 1069 MB / 1820 MB (883 MB allocated, but free)
Java version: 1.8.0_251-b08, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920x1080 (scaling 1.0x1.0)
Maximum Screen Size: 1920x1080
Best cursor sizes: 16x16 -> 32x32, 32x32 -> 32x32
Dataset consistency test: No problems found

Plugins:
+ FastDraw (35499)
+ RelationDissolve (0.2.0)
+ apache-commons (35524)
+ auto_tools (73)
+ conflation (0.6.6)
+ contourmerge (v0.1.6)
+ ejml (35313)
+ geotools (35169)
+ jaxb (35092)
+ jts (35122)
+ log4j (35092)
+ merge-overlap (35248)
+ opendata (35513)
+ reverter (35556)
+ shrinkwrap (v1.0.3)
+ undelete (35521)
+ utilsplugin2 (35487)

Last errors/warnings:
- 00007.182 W: Update plugins - You updated your JOSM software. To prevent problems the plugins should be updated as well.  Update plugins now?
- 00020.114 W: Region [TMS_BLOCK_v2] : Problem verifying disk.

[zelonewolf@…]

Attaching JOSM session demonstrating the issue.

[Klumbumbus]

Closed as duplicate of #19581.
The (non working) fix button for duplicate nodes for layers without downloaded area was disabled in r17096.