diff --git a/icu4c/source/test/testdata/conversion.txt b/icu4c/source/test/testdata/conversion.txt
index 9162c32b79a..22b8118824d 100644
--- a/icu4c/source/test/testdata/conversion.txt
+++ b/icu4c/source/test/testdata/conversion.txt
@@ -929,6 +929,13 @@ conversion:table(nofallback) {
           :intvector{},
           :int{0}, :int{0}, "", ".", :bin{""}
         }
+        {
+          "*test5",
+          :bin{ 0906 },
+          "\udbc8\udf45\u0006",
+          :intvector{},
+          :int{0}, :int{0}, "", ".", :bin{""}
+        }
       }
     }
 
diff --git a/icu4c/source/test/testdata/test5.ucm b/icu4c/source/test/testdata/test5.ucm
index eb3ebe73438..0b2a8356b8a 100644
--- a/icu4c/source/test/testdata/test5.ucm
+++ b/icu4c/source/test/testdata/test5.ucm
@@ -19,6 +19,7 @@
 CHARMAP
 
 <U0006>     \x06 |0
+<U102345>   \x09 |0
 <U0034>     \x01\x03 |3
 <U0074>     \x01\x07 |1
 
diff --git a/icu4j/main/shared/data/testdata.jar b/icu4j/main/shared/data/testdata.jar
index 336db8d5e59..8499614a7ca 100755
--- a/icu4j/main/shared/data/testdata.jar
+++ b/icu4j/main/shared/data/testdata.jar
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:fb7c24961b3cd13b1f29084dfbbb51bfc3c3f844b55d790a229f34b2a4c14f81
-size 773475
+oid sha256:383048fb67737609562a4b8bb86514f03dafb2d54e94127d426f336c336b3164
+size 773540