Hi Ethan, we initially thought that was the issue as well. However, I reverted your plugin to an earlier version without changing anything else and it immediately started working again.
I will hold off on updating the plugin in the future until I hear that the bug causing notifications to not be sent is resolved.
I began to realize it was a bug in the plugin when I could manually resend the notifications with no problem, but they would not send automatically for some reason. This showed me that obviously there was not a problem with my SMTP or the notification settings since it would not send manually either of that were the case.