Vanguard Not Working In PvP Defense

Platform, device version and operating system
Xbox One S

What you were expecting to happen, and what actually happened
Vanguard is enabled in the skill tree and at the start of battle my hero should have barrier. For the most part, this works as expected.

However, when choosing the hero as a defender in PvP, hero doesn’t have barrier when battle starts.

How often does this happen? When did it begin happening?
Just noticed it today when I decided to put my hero in the line up and yes, it’s consistent regardless of weapon or position.

Steps to make it happen again
Choose Knight class, select Vanguard in the skill tree, make the hero part of the defense team.

There are some skills that don’t trigger when defending in pvp. I’m 100% sure the devs are working on a fix for this issue in the next update.