Hi Nyema,
Thanks for posting in the community and sorry for the inconvenience that happen to you.
Based on the situation, please try the following method and check if it helps.
- After creating a new list from the existing list, please open the two lists in the browser.
- You can bulk copy/paste the data from the original list to the new list.
In the original list, please click "Edit in grid view", select all content or select values in one column, press Ctrl+ C to copy, go to the new list, click "Edit in grid view", select the same numbers of cells (make sure there is no cursor in one cell), press Ctrl + V to paste.
Also, I recommend you vote for the suggestion in the Microsoft Feedback Portal where members posted and voted for a similar suggestion here. It's the platform for us to hear your voice and improve our products.
Appreciate your understanding and patience.
Sincerely,
George | Microsoft Community Moderator