The MapViewer example stops loading tiles after a short while

Checking out the latest dev HEAD in qtbase makes the mapviewer example stop loading the tiles after a short while. Changing plugin or map type has the same effect: tiles are loaded a bit, then nothing more is loaded.

The problem seems to originate from the fix for QTBUG-56476.

Note: the debug error about satellite provider is unrelated.

Note2: timeout errors from the tile fetcher are not spitted when the loading stops working. To compare: use a working qtbase, run the example, then unplug the cable and move around. timeout errors due to network failures are printed

Note3: reverting qtbase to the sha immediatly before the fix for QTBUG-56476
solves the problem but seems to introduce slowness in the tile loading