diff --git a/doc/release-notes/11592-HandleParsing_fix.md b/doc/release-notes/11592-HandleParsing_fix.md
new file mode 100644
index 00000000000..087655d77c4
--- /dev/null
+++ b/doc/release-notes/11592-HandleParsing_fix.md
@@ -0,0 +1 @@
+A bug introduced in v6.5 broken Handle parsing when using a lower-case shoulder. This is now fixed.
\ No newline at end of file
diff --git a/src/main/java/edu/harvard/iq/dataverse/pidproviders/AbstractPidProvider.java b/src/main/java/edu/harvard/iq/dataverse/pidproviders/AbstractPidProvider.java
index 469b3505165..d7da92f5dd7 100644
--- a/src/main/java/edu/harvard/iq/dataverse/pidproviders/AbstractPidProvider.java
+++ b/src/main/java/edu/harvard/iq/dataverse/pidproviders/AbstractPidProvider.java
@@ -343,8 +343,13 @@ public GlobalId parsePersistentId(String protocol, String authority, String iden
         if (!PidProvider.isValidGlobalId(protocol, authority, identifier)) {
             return null;
         }
+        String comparableShoulder = getShoulder();
+        
         if(isCaseInsensitive) {
             identifier = identifier.toUpperCase();
+            if(comparableShoulder != null) {
+                comparableShoulder = comparableShoulder.toUpperCase();
+            }
         }
         // Check authority/identifier if this is a provider that manages specific
         // identifiers
@@ -362,7 +367,7 @@ public GlobalId parsePersistentId(String protocol, String authority, String iden
             logger.fine("managed in " + getId() + ": " + getManagedSet().contains(cleanIdentifier));
             logger.fine("excluded from " + getId() + ": " + getExcludedSet().contains(cleanIdentifier));
 
-            if (!(((authority.equals(getAuthority()) && identifier.startsWith(getShoulder().toUpperCase()))
+            if (!(((authority.equals(getAuthority()) && identifier.startsWith(comparableShoulder))
                     || getManagedSet().contains(cleanIdentifier)) && !getExcludedSet().contains(cleanIdentifier))) {
                 return null;
             }
diff --git a/src/test/java/edu/harvard/iq/dataverse/pidproviders/PidUtilTest.java b/src/test/java/edu/harvard/iq/dataverse/pidproviders/PidUtilTest.java
index 2058de1d6c2..3f8c198b0fe 100644
--- a/src/test/java/edu/harvard/iq/dataverse/pidproviders/PidUtilTest.java
+++ b/src/test/java/edu/harvard/iq/dataverse/pidproviders/PidUtilTest.java
@@ -107,7 +107,7 @@
 @JvmSetting(key = JvmSettings.PID_PROVIDER_LABEL, value = "HDL 1", varArgs = "hdl1")
 @JvmSetting(key = JvmSettings.PID_PROVIDER_TYPE, value = HandlePidProvider.TYPE, varArgs = "hdl1")
 @JvmSetting(key = JvmSettings.PID_PROVIDER_AUTHORITY, value = "20.500.1234", varArgs = "hdl1")
-@JvmSetting(key = JvmSettings.PID_PROVIDER_SHOULDER, value = "", varArgs = "hdl1")
+@JvmSetting(key = JvmSettings.PID_PROVIDER_SHOULDER, value = "test", varArgs = "hdl1")
 @JvmSetting(key = JvmSettings.PID_PROVIDER_MANAGED_LIST, value = "hdl:20.20.20/FK2ABCDEF", varArgs ="hdl1")
 @JvmSetting(key = JvmSettings.HANDLENET_AUTH_HANDLE, value = "20.500.1234/ADMIN", varArgs ="hdl1")
 @JvmSetting(key = JvmSettings.HANDLENET_INDEPENDENT_SERVICE, value = "true", varArgs ="hdl1")
@@ -294,16 +294,22 @@ public void testDOIParsing() throws IOException {
     @Test
     public void testHandleParsing() throws IOException {
         
-        String pid1String = "hdl:20.500.1234/10052";
+        String pid1String = "hdl:20.500.1234/test10052";
         GlobalId pid2 = PidUtil.parseAsGlobalID(pid1String);
         assertEquals(pid1String, pid2.asString());
         assertEquals("hdl1", pid2.getProviderId());
-        assertEquals("https://hdl.handle.net/" + pid2.getAuthority() + PidUtil.getPidProvider(pid2.getProviderId()).getSeparator() + pid2.getIdentifier(),pid2.asURL());
+        assertEquals("https://hdl.handle.net/" + pid2.getAuthority() + PidUtil.getPidProvider(pid2.getProviderId()).getSeparator() + pid2.getIdentifier(), pid2.asURL());
         assertEquals("20.500.1234", pid2.getAuthority());
         assertEquals(HandlePidProvider.HDL_PROTOCOL, pid2.getProtocol());
         GlobalId pid3 = PidUtil.parseAsGlobalID(pid2.asURL());
         assertEquals(pid1String, pid3.asString());
         assertEquals("hdl1", pid3.getProviderId());
+        
+        // Test case sensitivity - a handle with uppercase "TEST" should not match the hdl1 provider
+        String pid4String = "hdl:20.500.1234/TEST10052";
+        GlobalId pid4 = PidUtil.parseAsGlobalID(pid4String);
+        assertEquals(pid4String, pid4.asString());
+        assertEquals(UnmanagedHandlePidProvider.ID, pid4.getProviderId());
     }
 
     @Test