Why didn't you create that every addresses starts with letter 'B'
not just for mining but for everyone.
That way you would avoid issues with mining not getting rewards.
Thank you so much for pointing out.
The address starting with the upper case 'B' is the Legacy address, and the lower case 'b' is the SegWit address.
We did not want to hide the feature of SegWit.
But it may be that things should be simple.
We still have to consider for growth and we want to know what everyone of Wallet users thinks.