SelectWindow does not find my spawned window using version 3.5.6

In Firefox, when I was using Katalon Recorder version 3.4.10, my command:

SelectWindow title=Some Window Title 2018 v3.0

was able to select the window, and I could interact with the window. Since upgrading to version 3.5.6 this command no longer selects the window. I ran AssertAllWindowNames and it also does not find my spawned window.

Any ideas?

Ignore this, user error.