[Word] getting 'paragraph.listItem' is failed for deleted paragraph on only Web Word

[shinji-morimitsu]

Provide required information needed to triage your issue

We are implementing an automatic text update program in Word AddIn.
We need to update the document with take care of the tracked change histories.
Only Web Word causes a failure to get list or listItem of paragraph, if the paragraph is deleted.

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: Office on the web
• Host [Excel, Word, PowerPoint, etc.]: Word
• Office version number: ______
• Operating System: ______
• Browser (if using Office on the web): Chromium Edge 132.0.2957.127

Expected behavior

Same behavior with Native Word.
paragraph.load('list') or paragraph.load('listItem') are success and they should have values before deleted.

output should be:

paragraph[0]: text:[1st item] listItem:[] level:[0] index:[0]
paragraph[1]: text:[2nd item] listItem:[] level:[0] index:[0]
paragraph[2]: not list item

Current behavior

paragraph.load('list') or paragraph.load('listItem') are failed on Web Word, if the paragraph is deleted in change history.

getting "listOrNullObject" failed: RichApi.Error
getting "listItemOrNullObject" RichApi.Error
n {name: "RichApi.Error", code: "GeneralException", traceMessages: Array[0], innerError: null, debugInfo: Object…}

Steps to reproduce

1. run live example.

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Link to live example(s)

$("#run").on("click", () => tryCatch(run));

async function run() {
  OfficeExtension.config.extendedErrorLogging = true;

  await Word.run(async context => {
    // clear paragraph
    context.document.changeTrackingMode = Word.ChangeTrackingMode.off;
    context.document.body.clear();
    await context.sync();
    console.log('clear document');
  });
  await Word.run(async context => {
    // setup text
    const paragraph1st = context.document.body.insertParagraph("1st item", Word.InsertLocation.start);
    const paragraph2nd = paragraph1st.insertParagraph("2nd item", Word.InsertLocation.after);
    const list = paragraph1st.startNewList();
    await context.sync();
    paragraph1st.load('listItem');
    await context.sync();

    paragraph2nd.attachToList(list.id, paragraph1st.listItem.level);
    await context.sync();

    console.log('setup texts');
  });

  await Word.run(async context => {
    context.document.changeTrackingMode = Word.ChangeTrackingMode.trackAll;

    // delete one of item
    const paragraph = context.document.body.paragraphs.getFirst();
    paragraph.delete();
    await context.sync();

    console.log('delete paragraph');
  });

  await Word.run(async context => {
    const paragraphs = context.document.body.paragraphs;

    // get list item info
    paragraphs.load('listOrNullObject');
    try {
      await context.sync();
    } catch (error) {
      console.error(`getting "listOrNullObject" failed: ${error.name}`);
    }
    paragraphs.load('listItemOrNullObject');
    try {
      await context.sync();
    } catch (error) {
      console.error(`getting "listItemOrNullObject" ${error.name}`);
    }

    paragraphs.load('text,isListItem,listItemOrNullObject');
    await context.sync();

    paragraphs.items.forEach((paragraph, index) => {
      if (paragraph.isListItem) {
        console.log(`paragraph[${index}]: text:[${paragraph.text}] listItem:[${paragraph.listItemOrNullObject.listString ?? 'null'}] level:[${paragraph.listItemOrNullObject.level ?? 'null'}] index:[${paragraph.listItemOrNullObject.siblingIndex ?? 'null'}]`);
      } else {
        console.log(`paragraph[${index}]: not list item`);
      }
    })
  });
}

// Default helper for invoking an action and handling errors.
async function tryCatch(callback) {
  try {
    await callback();
  } catch (error) {
    // Note: In a production add-in, you'd want to notify the user through your add-in's UI.
    console.error(error);
  }
}

Provide additional details

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Context

We are implementing an automatic text update program in Word AddIn.
We need to update the document with take care of the tracked change histories and item symbol.
Because the program should match carefully the text output from our engine to the list item in Word.

Useful logs

• Console errors
• Screenshots
• Test file (if only happens on a particular file)

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