I have already posted this issue to my Product Team, the Product Team is investigating this issue. The response from Alex Dobin as below:
You should be able to use the same column name as already exists I believe. It looks like a change that was made for CDS native support (here) changed the return value for table information that we relied on for the custom table flow. I’ve filed this bug and assigned to runtime: Bug 4400324: Unable to create an app from data with a custom sharepoint list name.
If the issue is solved, I would reply here.
Community Support Team _ Kris Dai If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.