How can I use split at markers to split more than 12 clips at a time?

I'm attempting to split clip at markers. For some reason, even though I made 20 markers, the clip only splits into 12 at a time. I have to select the previous clip (last split clip), go forward and select the unsplit region again, then hit "split at markers" again in order for another 12 clips to be made.  In this gif, you can see the issue.  I'll assume I'm at fault. What am I doing wrong?
 

12-Split limit