The reason why the UI alert is not displayed is because the UI Error response structure is different when using the bulk API for deletion, so it is not displayed on the screen.
Deleting from the list contents screen also has the same problem
The script lock issue has been resolved, but the reject error message still appears within the DELETE script.
Still getting a blank popup with no error message.
Add reject(“text”); to the Delete schema.
When deleting content, a blank message is displayed instead of the text error message.