I grew that exact some one from Bonnie last year. Some of my pods had more blistering than others. Actually I have one I'm growing this year from the seeds of that one and it has the same thing going on. I think it depends on how much the plant is struggling maybe?
Attachments are photos of pods from 2018
The plant itself during a rebuild of my garden planter area
Pods from the plant this year that was grown from the seeds of the 2018 Bonnie (you can see blistering in the one pod but the other one in the photo is smoother).