diff --git a/integrationtests/test_issues.py b/integrationtests/test_issues.py
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+++ b/integrationtests/test_issues.py
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+# This file is a part of the CaosDB Project.
+#
+# Copyright (C) 2022 Indiscale GmbH <info@indiscale.com>
+#               2022 Florian Spreckelsen <f.spreckelsen@indiscale.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+#
+from pytest import fixture
+
+import caosdb as db
+
+
+@fixture
+def clear_database():
+    db.execute_query("FIND ENTITY").delete()
+
+
+def test_issue_23(clear_database):
+    """Test that an update leaves existing properties, that were not found by
+    the crawler, unchanged.
+
+    """
+
+    # insert a simplistic model
+    prop_ident = db.Property(name="identifying_prop", datatype=db.TEXT)
+    prop_a = db.Property(name="prop_a", datatype=db.TEXT)
+    prop_b = db.Property(name="prop_b", datatype=db.TEXT)
+    rt = db.RecordType(name="TestType")
+    rec = db.Record(name="TestRec").add_parent(rt)
+    rec.add_property(name="identifying_prop", value="identifier")
+    rec.add_property(name="prop_a", value="something")
+    db.Container().extend([prop_ident, prop_a, prop_b, rt, rec]).insert()