Death by Aspect power
I’ve run into this before during the sanctum sprint. Spamming the lightning skill too quickly seems cause this and I don’t run into it if I actually wait to land before hitting the key again. Basically you can’t chain jumps back to back with no time in between without dying after the 3rd or 4th time.
It’s a desync issue, you see yourself on top, the server thinks you fell and died.
Happens to me a lot on that wind jump bit too. Around 25% of the time is certain death, whereby I press “1” but instead of jumping just die instantly.
Then people at ground level can revive me and I stand back up on the platforms. And ANet expects people with these issues to actually compete in that Sanctum Sprint. <shrug>