Data Validation dropdown arrow no longer visible on hover – replaced by Copilot icon?

After the latest Microsoft 365 Excel update, I'm seeing a UI change that affects Data Validation dropdowns.

Previously:

• When hovering over a cell with Data Validation (type = list), the small dropdown arrow was visible.
• Users could clearly see that the cell had a selectable list.

Now:

• On hover, the dropdown arrow is no longer visible.
• Instead, I only see the AI Copilot icon next to the cell.

I'm generating Excel files programmatically (Node.js, tested with both ExcelJS and xlsx-populate), and the behavior is the same across both libraries. That suggests this is coming from Excel's UI layer, not from how the file is generated.

I tested with:

• ExcelJS → dropdown arrow not visible on hover
• xlsx-populate → dropdown arrow appears normally on hover

My questions:

1. Is this an intentional UI change related to Copilot integration?
2. Is there any way to restore the dropdown arrow visibility on hover?
3. Can Copilot be disabled at the workbook level (not locally per user)?
4. Has anyone found a workaround to make dropdown cells visually obvious again?

This impacts usability because users don't immediately realize a cell has a list anymore.