revert: "fix: ensure numbered list start property always present (#2241) (#2242)"

This reverts commit 5d13b0a.

Author: nperez0111

packages/core/src/blocks/ListItem/NumberedListItem/block.ts

@@ -51,9 +51,13 @@ export const createNumberedListItemBlockSpec = createBlockSpec(
 
         const defaultProps = parseDefaultProps(element);
 
+        if (element.previousElementSibling || startIndex === 1) {
+          return defaultProps;
+        }
+
         return {
           ...defaultProps,
-          start: element.previousElementSibling || startIndex === 1 ? undefined : startIndex,
+          start: startIndex,
         };
       }
 

tests/src/unit/core/blocks/NumberedListItem.test.ts

@@ -1125,17 +1125,4 @@ Regular paragraph`,
     },
     executeTest: testParseMarkdown,
   },
-  {
-    testCase: {
-      name: "issue2241NumberedListStartProperty",
-      content: `1. First item
-2. Second item
-3. Third item
-
-5. List starting at 5
-6. Second item
-7. Third item`,
-    },
-    executeTest: testParseMarkdown,
-  },
 ];