Duplicate Test Cases When Uploading Results

When using the Test Automation process for uploading results in Zephyr for Jira Cloud, the process is creating duplicate test cases each time I do so. I found a discussion from four years ago informing me that the reason for this is that my junit file probably has special characters that causes confusion, but is this honestly still the case? Given test naming conventions, I can't believe this issue still hasn't been fixed.