**Steps to replicate the issue** (include links if applicable):
* Original https://commons.wikimedia.org/w/index.php?title=Data:Route_through_the_landscape_of_cultural_interest_of_Vélez-Blanco.map&oldid=814915600
* When retrieving jsondata for this item: https://commons.wikimedia.org/w/api.php?action=jsondata&origin=*&formatversion=2&format=json&title=Route%20through%20the%20landscape%20of%20cultural%20interest%20of%20Vélez-Blanco.map
* This is basically how wikidata retrieves the geojson for a mapshape of `P3896`
* Fails on https://www.wikidata.org/wiki/Q123002533#P3896
**What happens?**:
* empty data attribute. all geojson is missing
**What should have happened instead?**:
the coordinates should have been in the json output.
**Software version** (skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):
First suspicion was that the validation rules do not allow for optional elevation (the third number in a coordinate pair in geojson).
When I removed the elevation information
https://commons.wikimedia.org/w/index.php?title=Data:Route_through_the_landscape_of_cultural_interest_of_Vélez-Blanco.map&oldid=815098976
The api call did report the correct jsondata temporarily. afterwards it flipped back to being without data.
**Later testing**
Every time I purge the Commons page, the jsondata is correct for 10 seconds and then returns to being empty. This is only when I make the request logged in, logged out, the contents stay the same. But it uses origin=*, so that should drop us to anonymous context, so it doesn't really make sense..