1 files changed, 7 insertions, 3 deletions
diff --git a/src/plugins/renderers/rhi/renderer/renderviewbuilder.cpp b/src/plugins/renderers/rhi/renderer/renderviewbuilder.cpp
index 6455d2e10..72c27de1d 100644
--- a/src/plugins/renderers/rhi/renderer/renderviewbuilder.cpp
+++ b/src/plugins/renderers/rhi/renderer/renderviewbuilder.cpp
@@ -466,9 +466,13 @@ public:
                 m_renderer->cache()->leafNodeCache[m_leafNode];
         dataCacheForLeaf.materialParameterGatherer.clear();
 
-        for (const auto &materialGatherer : qAsConst(m_materialParameterGathererJobs))
-            dataCacheForLeaf.materialParameterGatherer.unite(
-                    materialGatherer->materialToPassAndParameter());
+        for (const auto &materialGatherer : qAsConst(m_materialParameterGathererJobs)) {
+            const MaterialParameterGathererData &source = materialGatherer->materialToPassAndParameter();
+            for (auto it = std::begin(source); it != std::end(source); ++it) {
+                Q_ASSERT(!dataCacheForLeaf.materialParameterGatherer.contains(it.key()));
+                dataCacheForLeaf.materialParameterGatherer.insert(it.key(), it.value());
+            }
+        }
     }
 
 private: