Reverting a changeset moves nodes randomly

[Cobra]

When reverting a changeset, some nodes get moved around in a seemingly random way, leading to bizarre results like the one in the attached screenshot.
This is the result of reverting changeset 15875597, but it happened with other changesets in the same way.

The nodes being moved around haven't been changed in the changeset I wanted to revert and should be left unmodified.

This happens the same way each time I try to revert a given changeset. There's no difference between reverting in a layer with the complete region already loaded and starting from scratch without any data downloaded before.

At the moment, the reverter plugin isn't usable at all and damages data in a quite nasty way.

Build-Date: 2013-05-05 14:30:10
Revision: 5924
Is-Local-Build: true

Identification: JOSM/1.5 (5924 SVN en) Linux Ubuntu 11.04
Memory Usage: 268 MB / 3640 MB (150 MB allocated, but free)
Java version: 1.7.0_21, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
VM arguments: [-Xmx4G, -Dsun.java2d.opengl=false]
Dataset consistency test: No problems found

*snip*
Plugin: reverter (29553)
*snap*

Please note: the above information is from my own build, containing some extra patches, but the behaviour stays the same with the current josm-latest.jar downloaded from this server.

[Don-vip]

Fixed in [o29559].