After sending a service request to LINE they responded with a fix that didn't actually address my problem. Since I work doing validation at a software company I know what kind of information they might want to actually root cause this and fix the problem so I crafted a reply with all the details which would be useful in recreating this issue.
A day later they respond again and tell me to install the latest version from the Google Play Store. After installing this update I quickly tested by Direct Dialing my wife and confirmed they have fixed the problem. I'd like to thank the team at LINE for their quick response and turnaround to this issue.