diff --git a/chrome/content/zotero/xpcom/utilities_internal.js b/chrome/content/zotero/xpcom/utilities_internal.js
index ef5873723e..144e6a4557 100644
--- a/chrome/content/zotero/xpcom/utilities_internal.js
+++ b/chrome/content/zotero/xpcom/utilities_internal.js
@@ -1231,10 +1231,12 @@ Zotero.Utilities.Internal = {
 			if (!key
 					|| key != 'type'
 					|| skipKeys.has(key)
-					// 1) Ignore 'type: note' and 'type: attachment'
+					// 1) Ignore 'type: note', 'type: attachment', 'type: annotation'
 					// 2) Ignore 'article' until we have a Preprint item type
 					//    (https://github.com/zotero/translators/pull/2248#discussion_r546428184)
-					|| ['note', 'attachment', 'article'].includes(value)) {
+					|| ['note', 'attachment', 'annotation', 'article'].includes(value)
+					// Ignore numeric values
+					|| parseInt(value) == value) {
 				return true;
 			}
 			
diff --git a/test/tests/utilities_internalTest.js b/test/tests/utilities_internalTest.js
index 2224344052..3364e6224c 100644
--- a/test/tests/utilities_internalTest.js
+++ b/test/tests/utilities_internalTest.js
@@ -142,11 +142,22 @@ describe("Zotero.Utilities.Internal", function () {
 	
 	
 	describe("#extractExtraFields()", function () {
-		it("should ignore 'type: note' and 'type: attachment'", function () {
-			var str = 'type: note';
-			var { itemType, extra } = Zotero.Utilities.Internal.extractExtraFields(str);
-			assert.isNull(itemType);
-			assert.equal(extra, 'type: note');
+		it("should ignore 'Type: note', 'Type: attachment', and 'Type: annotation'", function () {
+			for (let type of ['note', 'attachment', 'annotation']) {
+				let str = `Type: ${type}`;
+				let { itemType, extra } = Zotero.Utilities.Internal.extractExtraFields(str);
+				assert.isNull(itemType, type);
+				assert.equal(extra, `Type: ${type}`, type);
+			}
+		});
+		
+		it("should ignore numeric values for Type", function () {
+			for (let type of ['3']) {
+				let str = `Type: ${type}`;
+				let { itemType, extra } = Zotero.Utilities.Internal.extractExtraFields(str);
+				assert.isNull(itemType, type);
+				assert.equal(extra, `Type: ${type}`, type);
+			}
 		});
 		
 		it("should use the first mapped Zotero type for a CSL type", function () {