I was playing a match in quick play when I duplicated the enemy D.Va. However, echo said “Sierra” which you can see in the subtitles or hear audibly. It is importantly to note that while the enemy team did not have a Sierra, ours did. Possibly a glitch relating to echoes new allied duplication?
I’m not familiar with posting on forums, so I very unfortunately cannot provide video evidence of this. But please, take my word for it.