Hello! I’m a partner to a fellow Mercy player that has accumulated nearly 550 hours of play time on her. In this time, We have experienced several bugs and have compiled a list of them that have happened on more than one occasion.
We have identified the following as bugs for they were not features of the game before, but rather happen occasionally or all the time. They have been implemented into the game over the past few patches and have not been fixed. With every patch introducing more (and not being fixed) it has come to me that Blizzard is not aware these bugs exist. I do not have footage of some of them happening, so I will add them when I can.
Do note: These videos are on Console, but these bugs persist both on PC and PS4. A lot of bugs aren’t noted, so PLEASE if you have more footage or know of threads, add them here. Let’s make Blizzard aware, these bugs are here almost for a year.
Guardian Angel
1. Target selector appears through walls
2. Player cannot GA because the TS falsely appears
Description: There is an ally behind a wall, but the TS appears even though Mercy cannot fly towards it. The animation begins but quickly cancels which causes the player to be locked in position until the GA button is let go. This misinformation disrupts the player, as previously you could hold the GA button down until a teammate was visible through the wall. However, this bug means that the player has to spend valuable time judging if they are truly around the wall to GA. This is not caused by cancelling GA, as the ability is not put on cool-down . In kill cams I believe the enemy cannot see this happening.
This is not including situations where the player has ‘Guardian Angel Prefers Beam Target: On’ and the beam is connected to an ally around a wall.
Video description: The first clip is me testing it on a Pharah. The second clip is it happening in a game when trying to fly to the high ground. It happens once and the second time it stops and goes on cool down is because I let go even though I could have flown. You have to let it go or else it’ll keep the player locked in position, and I’m used to doing it because of the bug at this point.
3. GA towards a teammate through a wall
Description: Flying to a teammate (quite obviously) through a wall.
Mercy Guardian Angel Bug - Flying To A Teammate Through A Wall
Video description: Junkrat was on high ground in a room, yet I was able to fly towards him through a wall.
Caduceus Staff
1. Healing audio cuts off
Description: This one is simple; the audio for healing just stops. It is only for Mercy. It does not always happen and some times it will come back either while healing someone or re-attaching the beam.
This happens on for any hero the beam is attached on, no matter what skin is used (therefore not a skin or hero related issue). It is usually for a brief period before it fixes itself.
Video description: In the first clip, the sound stops and starts several times on the tanks. For the second clip, it happens on Soldier.
Resurrect
1. Dead teammmate’s icon appears through a wall
Description: The icon appears to let the player know they are able to resurrect their teammate. However, this bug can make the player think they are able to Resurrect, when really they cannot. When pressing the Resurrect button, the animation begins but is quickly cancelled and not put on cool-down. This used to not happen and I’m sure it was not intentionally implemented.
2. Volskaya Industries moving platform
Description: Occasionally, Resurrect is cancelled when slow-falling off the platforms on Volskaya. The soul is clearly out of range some times when performing this resurrect, but I’ve had it cancel even while standing on the platform.
Resurrect on Platform Experiment
Video Description: Standing on the platform Resurrecting in range. 4 more clips of me testing it for range, slow falling and turning away.
Teammate Appearance
1. D.VA’s sillouette does not show when she is in and out of her mech for what I believe is only an issue for Mercy. This happens whenever there is a D.VA and continues all game.
Since posting this, I’ve noticed a person I was grouped up with (who was playing Reinhardt) was disappearing behind the wall for a couple milliseconds before reappearing. I can get footage of this and slow it down.
Mercy Bug: Teammate Appearance
Video description: A clip of D.VA not showing through the wall. Only the chevron does.
Conclusion
Most of these bugs have to do with LOS issues. Fix the TS appearing through walls and GA/Resurrect won’t cancel.
Thank you for reading this! 
I really hope all these bugs get fixed soon and no more make an appearance.