Some Bing tiles sometimes aren't displayed

[naoliv]

I am seeing a strange behavior while moving the screen and using Bing as background, but only at a specific place (location is here -20.46636901637565, -45.81031594444276 if needed) and some specific zoom levels.

Take a look at the attached video and you should see what is happening.

In some positions I can properly see all the tiles, but when moving to some other positions they suddenly get unavailable.

No matter if I ask to reload the tiles, reload the error tiles or clean the cache, I keep seeing the same problem.

With a zoom level of 50m or lower (> 50m) and 5m I can't see the problem.
With a zoom level of 30m or 10m I can see the problem.

I can't see nothing strange in console (from the INFO messages it seems that they were all loaded; also, it's possible to see that in certain positions, all the tiles are also displayed too)

JOSM:

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-07-13 23:20:15 +0200 (Wed, 13 Jul 2016)
Build-Date:2016-07-14 01:31:48
Revision:10531
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10531 pt_BR) Linux Debian GNU/Linux testing (stretch)
Memory Usage: 538 MB / 10206 MB (161 MB allocated, but free)
Java version: 1.8.0_91-8u91-b14-3-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
VM arguments: [-Dawt.useSystemAAFontSettings=on]
Dataset consistency test: No problems found

Plugins:
- Create_grid_of_ways (32440)
- ImportImagePlugin (32584)
- OpeningHoursEditor (32583)
- PicLayer (32495)
- RoadSigns (32584)
- SimplifyArea (32517)
- apache-commons (32584)
- buildings_tools (32639)
- conflation (0.2.0)
- contourmerge (1014)
- download_along (32535)
- editgpx (32485)
- ejml (32639)
- geojson (42)
- geotools (32584)
- importvec (32490)
- indoorhelper (32637)
- jts (32539)
- log4j (32309)
- measurement (32454)
- merge-overlap (32471)
- opendata (32584)
- pbf (32584)
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- poly (32584)
- reverter (32584)
- scripting (30723)
- todo (29154)
- turnrestrictions (32629)
- undelete (32584)
- utilsplugin2 (32584)