After copying the data to the Message Board, the numbered list not continuing

Issue

Copied the data from the Word file, pasted it into the Message Boards's Thread, and published it. After publishing the Thread, the number list is not continued and shows like:

1. 
  a.
1.
  a.
1
  a.

Steps to reproduce:
1. Navigate to the Content & Data > Message Boards > click on the action button(⋮) > Configuration > General > Message Format and change it from 'BBCode' to 'HTML'.
2. Again navigate to the Content & Data > Message Boards > click on the icon, and select 'Thread'.
3. Fill the 'Subject', copy the data and paste it into the Message Board's Thread 'Body', and Publish it. (Data attached for the same).
Observed Behavior: The number list was not continued and it showed.

1. a. b. 1. a. b. 1. a. b.

Expected Behavior: The number list should be continued and shown like this.

1. a. b. 2. a. b. 3. a. b.

The 'CKEditor 4' offers a variety of features, but there are some limitations. One such limitation is pasting content directly from MS Word. Kindly check: CKEditor 4 demo
If the requirement is to paste the content from MS Word into CKEditor, there might need to adjust the editor's configuration or install a plugin like "Paste from Word".
This plugin can be helpful because it preserves list formatting when pasting from Word, including numbering, styling, and indentation.

On a side note: Please choose to follow unofficial articles at your own discretion as these threads are not the official documentation of Liferay.