I don't think they'll fix that Dvalin bug soon as it's simply not worth it. Dvalin is quite an old boss which kinda means it's hard to fix this bug without creating 20 more bugs, also Dvalin's HP isn't that high so you can still one cycle it. In addition, most of the bugs listed here are very situational( I mean why would you use your burst on water?)
i mean Raiden has the same bug with her ult where her animation gets interrupted and it hasn't been fixed to this day, but since it's not really affecting gameplay, its not too bad not as bad as Arlecchino literally dying when she is supposed to be invulnerable during burst
There also bug when artefact domain start and use skill enemy wont get any mark so u need wait about 5 sec so it work but fixed few day ago when u downloading huge patch data around 500mb for mobile
yea dvalin for some reason wont give you your mark LOL and she can die in her burst or at least on the 1st few moments, cause IDK why its I frame is delayed for some reason?