diff --git a/chrome/content/zotero/xpcom/integration.js b/chrome/content/zotero/xpcom/integration.js
index b358939591..b435e97a4b 100644
--- a/chrome/content/zotero/xpcom/integration.js
+++ b/chrome/content/zotero/xpcom/integration.js
@@ -3033,6 +3033,45 @@ Zotero.Integration.CitationField = class extends Zotero.Integration.Field {
 				}
 			}
 
+			// Fix for Mac Word "All Caps" formatting corrupting field codes.
+			// All text including JSON keys and string values gets uppercased,
+			// but numbers/booleans are unaffected. We recover items via their
+			// integer ID and discard corrupted URIs/itemData.
+			// Distinct from old Zotero 2.x uppercase which only affected CITATIONITEMS.
+			if (citation.CITATIONID) {
+				Zotero.debug("Integration: Recovering citation field corrupted by All Caps formatting");
+				citation.citationID = citation.CITATIONID;
+				delete citation.CITATIONID;
+				
+				if (citation.PROPERTIES) {
+					if (!citation.properties) {
+						citation.properties = {};
+					}
+					// Preserve non-string values (unaffected by All Caps).
+					// Don't preserve dontUpdate -- we need to update since the
+					// presentation is corrupted.
+					if ('NOTEINDEX' in citation.PROPERTIES) {
+						citation.properties.noteIndex = citation.PROPERTIES.NOTEINDEX;
+					}
+					if ('UNSORTED' in citation.PROPERTIES) {
+						citation.properties.unsorted = citation.PROPERTIES.UNSORTED;
+					}
+					delete citation.PROPERTIES;
+				}
+				
+				// Delete corrupted URIs and itemData from citation items.
+				// loadItemData() will fall through to Zotero.Items.get(citationItem.id)
+				// for resolution, or handleMissingItem() if the item isn't found.
+				for (let citationItem of citation.citationItems) {
+					delete citationItem.uris;
+					// Existing CITATIONITEMS handling lowercases ITEMDATA to 'itemdata'
+					delete citationItem.itemdata;
+					delete citationItem.itemData;
+				}
+				
+				delete citation.SCHEMA;
+			}
+
 			if(!citation.properties) citation.properties = {};
 
 			for (let citationItem of citation.citationItems) {
diff --git a/test/tests/integrationTest.js b/test/tests/integrationTest.js
index a052530734..6fc2dc3614 100644
--- a/test/tests/integrationTest.js
+++ b/test/tests/integrationTest.js
@@ -1088,6 +1088,92 @@ describe("Zotero.Integration", function () {
 		});
 	});
 	
+	describe("CitationField", function () {
+		describe('#unserialize', function () {
+			it('should recover All Caps corrupted citation field', async function () {
+				// Simulate Mac Word "All Caps" formatting corrupting field code JSON.
+				// All text (keys and string values) is uppercased; numbers/booleans unaffected.
+				let testItem = testItems[0];
+				let allCapsCode = 'ITEM CSL_CITATION '
+					+ JSON.stringify({
+						CITATIONID: "ABCD1234",
+						PROPERTIES: {
+							FORMATTEDCITATION: "(AUTHOR 2025)",
+							PLAINCITATION: "(AUTHOR 2025)",
+							NOTEINDEX: 0
+						},
+						CITATIONITEMS: [{
+							ID: testItem.id,
+							URIS: ["HTTP://ZOTERO.ORG/USERS/12345/ITEMS/XXXXXXXX"],
+							ITEMDATA: {
+								ID: testItem.id,
+								TYPE: "ARTICLE-JOURNAL",
+								TITLE: "SOME TITLE"
+							}
+						}],
+						SCHEMA: "HTTPS://GITHUB.COM/CITATION-STYLE-LANGUAGE/SCHEMA/RAW/MASTER/CSL-CITATION.JSON"
+					});
+				
+				let field = new DocumentPluginDummy.Field(
+					new DocumentPluginDummy.Document()
+				);
+				field.code = allCapsCode;
+				field.text = "(Author 2025)";
+				
+				let citationField = new Zotero.Integration.CitationField(field, allCapsCode);
+				let citation = await citationField.unserialize();
+				
+				// citationID recovered
+				assert.equal(citation.citationID, "ABCD1234");
+				// properties recovered
+				assert.equal(citation.properties.noteIndex, 0);
+				// plainCitation and formattedCitation deleted to avoid changed-citation dialog
+				assert.notProperty(citation.properties, 'plainCitation');
+				assert.notProperty(citation.properties, 'formattedCitation');
+				// citationItems recovered with integer id
+				assert.equal(citation.citationItems.length, 1);
+				assert.equal(citation.citationItems[0].id, testItem.id);
+				// Corrupted URIs and itemData removed
+				assert.notProperty(citation.citationItems[0], 'uris');
+				assert.notProperty(citation.citationItems[0], 'itemData');
+				assert.notProperty(citation.citationItems[0], 'itemdata');
+			});
+			
+			it('should preserve non-string properties in All Caps corrupted citation', async function () {
+				let testItem = testItems[0];
+				let allCapsCode = 'ITEM CSL_CITATION '
+					+ JSON.stringify({
+						CITATIONID: "EFGH5678",
+						PROPERTIES: {
+							NOTEINDEX: 3,
+							UNSORTED: true,
+							DONTUPDDATE: true
+						},
+						CITATIONITEMS: [{
+							ID: testItem.id,
+							URIS: ["HTTP://ZOTERO.ORG/USERS/12345/ITEMS/XXXXXXXX"]
+						}],
+						SCHEMA: "HTTPS://GITHUB.COM/CITATION-STYLE-LANGUAGE/SCHEMA/RAW/MASTER/CSL-CITATION.JSON"
+					});
+				
+				let field = new DocumentPluginDummy.Field(
+					new DocumentPluginDummy.Document()
+				);
+				field.code = allCapsCode;
+				field.text = "(Author 2025)";
+				
+				let citationField = new Zotero.Integration.CitationField(field, allCapsCode);
+				let citation = await citationField.unserialize();
+				
+				assert.equal(citation.properties.noteIndex, 3);
+				assert.isTrue(citation.properties.unsorted);
+				// dontUpdate should NOT be preserved -- we need to update since
+				// the presentation is corrupted
+				assert.notProperty(citation.properties, 'dontUpdate');
+			});
+		});
+	});
+	
 	describe("DocumentData", function () {
 		it('should properly unserialize old XML document data', function () {
 			var serializedXMLData = `<data data-version="3" zotero-version="5.0.SOURCE"><session id="F0NFmZ32"/><style id="${styleID}" hasBibliography="1" bibliographyStyleHasBeenSet="1"/><prefs><pref name="fieldType" value="ReferenceMark"/><pref name="automaticJournalAbbreviations" value="true"/><pref name="noteType" value="0"/></prefs></data>`;