diff --git a/libs/iblprefilter/src/IBLPrefilterContext.cpp b/libs/iblprefilter/src/IBLPrefilterContext.cpp
index b7c16afcb5..8acfc1aa88 100644
--- a/libs/iblprefilter/src/IBLPrefilterContext.cpp
+++ b/libs/iblprefilter/src/IBLPrefilterContext.cpp
@@ -50,16 +50,18 @@
 
 #include "generated/resources/iblprefilter_materials.h"
 
+namespace {
+
 using namespace filament::math;
 using namespace filament;
 
-constexpr static float4 sFullScreenTriangleVertices[3] = {
-        { -1.0f, -1.0f, 1.0f, 1.0f },
-        { 3.0f,  -1.0f, 1.0f, 1.0f },
-        { -1.0f, 3.0f,  1.0f, 1.0f }
+constexpr float4 sFullScreenTriangleVertices[3] = {
+    { -1.0f, -1.0f, 1.0f, 1.0f },
+    { 3.0f,  -1.0f, 1.0f, 1.0f },
+    { -1.0f, 3.0f,  1.0f, 1.0f }
 };
 
-constexpr static const uint16_t sFullScreenTriangleIndices[3] = { 0, 1, 2 };
+constexpr uint16_t sFullScreenTriangleIndices[3] = { 0, 1, 2 };
 
 static float lodToPerceptualRoughness(float lod) noexcept {
     // Inverse perceptualRoughness-to-LOD mapping:
@@ -75,10 +77,22 @@ static float lodToPerceptualRoughness(float lod) noexcept {
 }
 
 template<typename T>
-static inline constexpr T log4(T x) {
+constexpr T log4(T x) {
     return std::log2(x) * T(0.5);
 }
 
+static void cleanupMaterialInstance(MaterialInstance const* mi, Engine& engine, RenderableManager& rcm,
+    RenderableManager::Instance const& ci) {
+    // mi is already nullptr, there is no need to clean up again.
+    if (mi == nullptr)
+        return;
+
+    rcm.clearMaterialInstanceAt(ci, 0);
+    engine.destroy(mi);
+}
+
+} // anonymous
+
 
 IBLPrefilterContext::IBLPrefilterContext(Engine& engine)
         : mEngine(engine) {
@@ -256,7 +270,6 @@ Texture* IBLPrefilterContext::EquirectangularToCubemap::operator()(
 
     RenderableManager& rcm = engine.getRenderableManager();
     auto const ci = rcm.getInstance(mContext.mFullScreenQuadEntity);
-    rcm.setMaterialInstanceAt(ci, 0, mi);
 
     TextureSampler environmentSampler;
     environmentSampler.setMagFilter(SamplerMagFilter::LINEAR);
@@ -278,8 +291,17 @@ Texture* IBLPrefilterContext::EquirectangularToCubemap::operator()(
     mi->setParameter("mirror", mConfig.mirror ? -1.0f : 1.0f);
 
     for (size_t i = 0; i < 2; i++) {
-        mi->setParameter("side", i == 0 ? 1.0f : -1.0f);
-        mi->commit(engine);
+        // This is a workaround for internal bug b/419664914 to duplicate same material for each draw.
+        // TODO: properly address the bug and remove this workaround.
+#if defined(__EMSCRIPTEN__)
+        MaterialInstance *const tempMi = MaterialInstance::duplicate(mi);
+#else
+        MaterialInstance *const tempMi = mi;
+#endif
+        rcm.setMaterialInstanceAt(ci, 0, tempMi);
+
+        tempMi->setParameter("side", i == 0 ? 1.0f : -1.0f);
+        tempMi->commit(engine);
 
         builder.face(RenderTarget::AttachmentPoint::COLOR0, faces[i][0])
                .face(RenderTarget::AttachmentPoint::COLOR1, faces[i][1])
@@ -289,6 +311,10 @@ Texture* IBLPrefilterContext::EquirectangularToCubemap::operator()(
         view->setRenderTarget(rt);
         renderer->renderStandaloneView(view);
         engine.destroy(rt);
+
+#if defined(__EMSCRIPTEN__)
+        cleanupMaterialInstance(tempMi, engine, rcm, ci);
+#endif
     }
 
     rcm.clearMaterialInstanceAt(ci, 0);
@@ -344,10 +370,8 @@ IBLPrefilterContext::IrradianceFilter::IrradianceFilter(IBLPrefilterContext& con
 
     renderer->renderStandaloneView(view);
 
-    rcm.clearMaterialInstanceAt(ci, 0);
-
+    cleanupMaterialInstance(mi, engine, rcm, ci);
     engine.destroy(rt);
-    engine.destroy(mi);
 }
 
 UTILS_NOINLINE
@@ -416,7 +440,6 @@ Texture* IBLPrefilterContext::IrradianceFilter::operator()(Options options,
 
     RenderableManager& rcm = engine.getRenderableManager();
     auto const ci = rcm.getInstance(mContext.mFullScreenQuadEntity);
-    rcm.setMaterialInstanceAt(ci, 0, mi);
 
     const uint32_t sampleCount = mSampleCount;
     const float linear = options.hdrLinear;
@@ -448,8 +471,17 @@ Texture* IBLPrefilterContext::IrradianceFilter::operator()(Options options,
     view->setViewport({ 0, 0, dim, dim });
 
     for (size_t i = 0; i < 2; i++) {
-        mi->setParameter("side", i == 0 ? 1.0f : -1.0f);
-        mi->commit(engine);
+        // This is a workaround for internal bug b/419664914 to duplicate same material for each draw.
+        // TODO: properly address the bug and remove this workaround.
+#if defined(__EMSCRIPTEN__)
+        MaterialInstance *const tempMi = MaterialInstance::duplicate(mi);
+#else
+        MaterialInstance *const tempMi = mi;
+#endif
+        rcm.setMaterialInstanceAt(ci, 0, tempMi);
+
+        tempMi->setParameter("side", i == 0 ? 1.0f : -1.0f);
+        tempMi->commit(engine);
 
         builder.face(RenderTarget::AttachmentPoint::COLOR0, faces[i][0])
                .face(RenderTarget::AttachmentPoint::COLOR1, faces[i][1])
@@ -459,10 +491,13 @@ Texture* IBLPrefilterContext::IrradianceFilter::operator()(Options options,
         view->setRenderTarget(rt);
         renderer->renderStandaloneView(view);
         engine.destroy(rt);
+
+#if defined(__EMSCRIPTEN__)
+        cleanupMaterialInstance(tempMi, engine, rcm, ci);
+#endif
     }
 
     rcm.clearMaterialInstanceAt(ci, 0);
-
     engine.destroy(mi);
 
     return outIrradianceTexture;
@@ -554,10 +589,8 @@ IBLPrefilterContext::SpecularFilter::SpecularFilter(IBLPrefilterContext& context
 
     renderer->renderStandaloneView(view);
 
-    rcm.clearMaterialInstanceAt(ci, 0);
-
+    cleanupMaterialInstance(mi, engine, rcm, ci);
     engine.destroy(rt);
-    engine.destroy(mi);
 }
 
 UTILS_NOINLINE
@@ -655,7 +688,6 @@ Texture* IBLPrefilterContext::SpecularFilter::operator()(
 
     RenderableManager& rcm = engine.getRenderableManager();
     auto const ci = rcm.getInstance(mContext.mFullScreenQuadEntity);
-    rcm.setMaterialInstanceAt(ci, 0, mi);
 
     const uint32_t sampleCount = mSampleCount;
     const float linear = options.hdrLinear;
@@ -703,8 +735,17 @@ Texture* IBLPrefilterContext::SpecularFilter::operator()(
         view->setViewport({ 0, 0, dim, dim });
 
         for (size_t i = 0; i < 2; i++) {
-            mi->setParameter("side", i == 0 ? 1.0f : -1.0f);
-            mi->commit(engine);
+            // This is a workaround for internal bug b/419664914 to duplicate same material for each draw.
+            // TODO: properly address the bug and remove this workaround.
+#if defined(__EMSCRIPTEN__)
+            MaterialInstance *const tempMi = MaterialInstance::duplicate(mi);
+#else
+            MaterialInstance *const tempMi = mi;
+#endif
+            rcm.setMaterialInstanceAt(ci, 0, tempMi);
+
+            tempMi->setParameter("side", i == 0 ? 1.0f : -1.0f);
+            tempMi->commit(engine);
 
             builder.face(RenderTarget::AttachmentPoint::COLOR0, faces[i][0])
                    .face(RenderTarget::AttachmentPoint::COLOR1, faces[i][1])
@@ -714,13 +755,16 @@ Texture* IBLPrefilterContext::SpecularFilter::operator()(
             view->setRenderTarget(rt);
             renderer->renderStandaloneView(view);
             engine.destroy(rt);
+
+#if defined(__EMSCRIPTEN__)
+            cleanupMaterialInstance(tempMi, engine, rcm, ci);
+#endif
         }
 
         dim >>= 1;
     }
 
     rcm.clearMaterialInstanceAt(ci, 0);
-
     engine.destroy(mi);
 
     return outReflectionsTexture;