Steps to Reproduce:
- Head to https://query.wikidata.org/ and open the "Filter labels using EntitySearch from mwapi service to provide Full Text Search" example.
- Use the "Code" button to generate an URL for this query. Add &format=json at the end to allow viewing the result in a web browser. You should arrive at this URL.
- Spam CTRL + F5 to force refresh the page a bunch of times (usually at least 10) and take note of the results.
Most of the time, the results will be empty. Sometimes, however, the correct results are returned.
The results are always correctly populated.