This question already has an answer here:
Yesterday I posted a question on the Mathematics Stack exchange. I received some answers to which I added a comment, trying to apply an @ tag for the user that wrote the answer. However, when I usually do this, a popup box for auto-completion usually comes up. This time it didn't, but I continued to type the full name out anyway and posted the comment. But, the @ tag was removed from the published comment. This has worked before in the past, why is it not working now?
I always put the tag first before writing anything else
It has worked in the past
I have tried multiple tests with other posts, using other names. That is, it is persistent and reproducible
- I have closed down my browser, tried different browsers, indeed different devices! Same result.