Can't kill Shaterer because of the overflow
Overflows are happening regularly on the meta events that are tracked on dragon timer websites since the loot was increased. There’s now a guaranteed rare + a chance at an exotic (possibly precursor).
One thing I’m doing is running the other 15 or so events that aren’t tracked on websites and also sticking around to kill the boss on overflow. I got a Jormag kill on overflow yesterday and Teq the day before that
The overflow is happening because Anet lowered the limit in zones before it goes to overflow, created new content that forces players to run around different zones in large numbers, and has increased the loot on meta event chests.
They are compounding one another to create increases in overflow populations. One thing though is that you can still kill shatterer and get chest loot in overflow. Its just not tracked on any site to timing it is almost impossible.