Ways downloaded through "Download parent ways/relations" sometimes have some nodes not loaded

[kolen]

JOSM version 4279

How to reproduce (hope that data in that area will not changed noticeably):

Start with no data layers.

1. Download area:

lat 56.6444066 - 56.6451794
lon 47.8568101 - 47.8582

(Can be done using remote control ​http://127.0.0.1:8111/load_and_zoom?left=47.8568101&bottom=56.6444066&right=47.8582&top=56.6451794 )

2. Select east-most node of road, where two links to roundabout join (node 637694461)

3. Select "Download parent ways/relations" from menu (Ctrl+Alt+D)

4. After way adjacent to that node (way 48522817) is downloaded, some nodes of it have strange appearance in josm view (styled view shows no line of way, just nodes, wireframe view shows lines to far outside (to infinity).

5. When saving this dataset to .osm xml file (test2.osm​) and opening again, it shows the same. However, coordinates of nodes in .osm file look correct, and it opens without errors, and 'status report' shows "Dataset consistency test: No problems found".

Just starting josm and opening (test2.osm​) also causes this problem for me to appear.

Update: found that resulting xml does not have two of nodes: 1365747928 and 1365747989 referenced in way 48522817, these nodes are displayed as far away. Seems that they are not loaded by "Download parent ways/relations". But status report shows that data consistency test passes (it allows not loaded nodes of ways?).

[kolen]

Screenshot (wireframe view)

[kolen]

Screenshot (styled view)

[kolen]

Status report

[kolen]

Dataset loaded when doing things described in how to reproduce

[kolen]

Recorded traffic, first josm gets /api/0.6/node/637694461/ways and it returns correct list of nodes in way. But then when doing /api/0.6/nodes josm skips some nodes:

http://api.openstreetmap.org/api/0.6/nodes?nodes=639251730,639251731,324379478,324163048,1365747926,416636331,705416990,413411505,323904576,649176539,613061428,413410370

It skips 1365747928 and 1365747989, other nodes of way 48522817 are downloaded.

And should "data consistency test" complain about ways containing not loaded nodes?

[kolen]

Maybe related to [4094/josm]