Its definitely Radial Cracking, I have had a lot of this in August but "0" up til August. It has subsided and now I'm not getting any cracks. This happened in my Big Beef and Jetstars.
I attribute this to the extremely hot days with lots of rain.
Mine crack but heal over, some will start to rot at the crack if you leave them too long
My cracked ones I cut the tops off and eat or if I have too many cracked tomatoes that look like they're weeping or have opened up, I aggressively cut out the cracks, core, half and freeze for sauce.
July 15th "0" cracking
July 17th "0" cracking
July 27th, a few radial cracks in a couple tomatoes.
By the early part of August till late part of August almost every tomato had radial cracking, the fruit on now is showing no signs of radial cracking.