Comment 1 for bug 1499985

I have the same Issue.
In my monitor setup I have two monitors side by side, where Plank is on the left side of the right monitor.

Monitor A | Monitor B
           P
           L
           A
           N
           K
           |

I am using elementary os in the version elementary OS 0.4.1 Loki with Plank in the version 0.11.3
I have attached screenshots with my settings as well as the error.
Plank blocks the window from moving completely to the second (left) monitor.

I have noticed that enabling the "Hide Dock" settings allows me to move windows to the left screen.
Currently I am using this workaround, however I would much rather have the dock visible at all times.