Invisible Detonate Dead preparation

https://youtu.be/rLcO1tZyHzc

Happened in HCSSF fate of the vaal league to my character (TedddyKitavaBear), with those stats in a T12. Either the pre-explosion animation isn't rendered, or it's an instant post mortem detonate dead that shouldn't exist, and/or the damage dealt is way more than it should.

If it's not a bug and that's a legit thing, feel free to explain what happened because I'm speechless. Thanks in advance!

I didn't see it fixed in the hotfixes mentions. If anybody can confirm that's only the visual preparation that is bugged and not the damage as well, that'll be a relief. Thanks !