I hope this answers your question. Note on my gray colored image and also on your coin, there are areas where there is weakness on the simulated columns. That is from heavy die polishing removing part of the fields, (bays are part of the fields) affected the mid devices (simulated columns) to remove die clashes. A lot of detail can be lost each time a die is polished down. So die clashes must happen a lot during the life span of 1,400,000 average coins struck per die on business strike coins.