Steps to reproduce:
- Open the same talk page open on two windows, one logged in and one not logged in, in an incognito window
- On both tabs, draft a reply to the same comment.
- Hit the reply button one after another. (I know this is not an exact simulation of true race condition, but the timestamp shown was the same, so I considered it as a race condition. I can try doing it at the same time too if that's more helpful to figure out the exact test result).
- After clicking on the reply button, on both tabs it was showing their own replies correctly, but after a refresh it seemed it discarded one of the replies and kept the one from the anonymous user.
Test Environment: Beta cluster