No results on working query

[guyg6802]

Hi Thanks for this great Plugin
I used the folowing query that work on wikibase

PREFIX wd: <https://timna-database.wikibase.cloud/entity/>
PREFIX wdt: <https://timna-database.wikibase.cloud/prop/direct/>
PREFIX p: <https://timna-database.wikibase.cloud/prop/>
PREFIX ps: <https://timna-database.wikibase.cloud/prop/statement/>
PREFIX geo: <http://www.opengis.net/ont/geosparql#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>

SELECT DISTINCT ?entity ?entityLabel ?coordinate (GROUP_CONCAT(DISTINCT ?periodLabel; separator=", ") AS ?periodLabels) (GROUP_CONCAT(DISTINCT ?categoryLabel; separator=", ") AS ?categories) ?longitude ?latitude
WHERE {
  ?entity wdt:P28 ?coordinate .
  
  ?entity p:P94 ?smeltingStatement .
  ?smeltingStatement ps:P94 wd:Q89 .

  ?entity p:P94 ?statement .
  ?statement ps:P94 ?category .
  ?category rdfs:label ?categoryLabel .
  FILTER (lang(?categoryLabel) = "en")

  ?entity rdfs:label ?entityLabel .
  FILTER (lang(?entityLabel) = "en")

  OPTIONAL { ?entity wdt:P26 ?longitude . }
  OPTIONAL { ?entity wdt:P27 ?latitude . }

  OPTIONAL {
    ?entity wdt:P93 ?period .
    ?period rdfs:label ?periodLabel .
    FILTER (lang(?periodLabel) = "en")
  }
}
GROUP BY ?entity ?entityLabel ?coordinate ?longitude ?latitude
LIMIT 300

using the endpoint https://timna-database.wikibase.cloud/query/sparql

it works on query services you can check here
but returns no results on QGIS