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diff --git a/libs/assimp/test/unit/utIssues.cpp b/libs/assimp/test/unit/utIssues.cpp
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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+#include <assimp/Exporter.hpp>
+#include <assimp/postprocess.h>
+
+#include "TestModelFactory.h"
+
+using namespace Assimp;
+
+class utIssues : public ::testing::Test {
+    // empty
+};
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+TEST_F( utIssues, OpacityBugWhenExporting_727 ) {
+    float opacity;
+    aiScene *scene( TestModelFacttory::createDefaultTestModel( opacity ) );
+    Assimp::Importer importer;
+    Assimp::Exporter exporter;
+
+    std::string path = "dae";
+    const aiExportFormatDesc *desc = exporter.GetExportFormatDescription( 0 );
+    EXPECT_NE( desc, nullptr );
+    path.append(".");
+    path.append( desc->fileExtension );
+    EXPECT_EQ( AI_SUCCESS, exporter.Export( scene, desc->id, path ) );
+    const aiScene *newScene( importer.ReadFile( path, aiProcess_ValidateDataStructure ) );
+    ASSERT_NE( nullptr, newScene );
+    float newOpacity;
+    if ( newScene->mNumMaterials > 0 ) {
+        std::cout << "Desc = " << desc->description << "\n";
+        EXPECT_EQ( AI_SUCCESS, newScene->mMaterials[ 0 ]->Get( AI_MATKEY_OPACITY, newOpacity ) );
+        EXPECT_FLOAT_EQ( opacity, newOpacity );
+    }
+    delete scene;
+}
+
+#endif // ASSIMP_BUILD_NO_EXPORT