Guessing you are at (0.4.2-1
Alf Gaida is the maintainer of nm-tray for Debian. He can be prickly, but he has not ever been so to me. If you have the details about being unable to get onto a hidden network you could email him. Or not. His email is below in the changelog. You probably could not go with filing on the Debian BTS.
Via the Debian change log
https://metadata.ftp-master.debian.org/changelogs//main/n/nm-tray/nm-tray_0.4.3-2_changelog
Nothing in the change log seems to hint at problems.
Debian Bts - only one bug #917924. Appears to be about tiling wm's.
But, you got it fixed via changing to network-manager.
peace out