This week, the tables of contents of two journals where I have articles accepted and forthcoming were updated, and I was relieved to see that my article appeared in both of them, as promised. I know of two cases where the article did not show up, because of the editor just forgetting to include it. It almost happened to me a few years ago, but an email inquiry to the editor saved me. As you can imagine, though I don't have a hard copy of the journal yet, seeing my articles included was a huge relief. The two cases I refer to above happened to people with tenure. In my case, since I am going up next year, it would have been a bigger problem.
I also observed one thing. In both cases, among the authors of other essays included in the TOC, there are scholars I have published with before (meaning that in the past, my articles have appeared in journals at the same time that essays from those scholars). I know personally two of them, and I've read the work of a third one. One of them has a pretty similar field of interest as I have. The other two, not that much. But I found it curious (though not surprising) to see names repeating from time to time. They are, in a way, my publishing companions.
Has this happened to you in the past? I imagine that if you are a full professor, it is not that unusual. As an assistant professor, I hadn't noticed it before.