Eos Version 3.2.7 Build 18
tested on Eos Ti and Gio
It seems that channels 1589 & 1590 cannot be selected when put in a Custom Direct Select Channel tile. Numbers lower and higher work just fine.
Is there some number voodoo magic involved that prevent these numbers to be selected?
I stumbled upon this problem over a year ago and made a macro to resolve the issue, but today my colleague had the same issue with the current software build.