Yeah, that's mild catfacing.
Some varieties are more prone to catfacing. I find it most often often in early fruit of large-fruited varieties. Ribbed/fluted varieties seem to be more prone to it than non-ribbed, and globes less prone than oblates. Fused blooms produce catfaced fruit almost all the time, in my experience, too.
Theories include damage to the blossom, colder temps during flower formation, etc. It's just a fact of life if you want to grow larger tomatoes, IMO. Nothing to worry about unless it continues far into the season and/or is so bad that you can't use a large portion of the fruit.
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