1st was the grenadier engi, then the condi meta, then the bunker bladesworn, then the 1shot chrono. And dont talk about the soulbeast, nowadays meta is just for people who spam 3 or 4 stuff, and dont even know what their skills do. Boring.
I saw it on lots of class in a thief in engi, i think is probably just a bug, but who know. Is like 99% of the attacks dont enter seen in 3v3 and seen in the 5v5.
Sometimes i seen people invulnerable every attack, just affected by area conditions and drop maybe 2% of their health. Is not something is blocked or failed attack, just is like if the enemy wasn't there, maybe is desync, but who know. Im starting see this every day.