So I was doing a speed 60 greater rift while everything got bugged. I made a short video what shows you what actually happened and I never seen something like this ever.
Bugs do happen from time to time. Server or connection errors of some kind. Nothing to do but quit and restart.
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Hello :
Please report bugs on the Bug Report forum :
https://us.forums.blizzard.com/en/d3/c/bug-report
This bug happens once in a while, but it is rare; it’s as if the Rift Guardian does not fully spawn. There has also been cases where the Rift Guardian spawned in walls and could not be attacked.
Yep, unfortunately… and lose the rift XP and gold bonus.
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That must be a super rare bug, i don’t think iv’e ever seen that happen before. Seems quite lucky to have caught it in a recording.
After listening to that video my hearing was bugged.
There does seem to still be some glitches in D3 - there is one in rifts where there is no exit from the level but I’ve not seen that one in a while.
That still occurs… it hasn’t been reported on the new forums yet but it used to be reported once or twice a month in the old Bug Report forum. For example:
Sometimes (very, very rarely), you can’t even enter the rift… you click on the portal in town, and it returns you to town. 
There’s also the one where you can’t resurrect from a death because the menu doesn’t pop up… and if you’re playing in a group, they can’t resurrect you… such as https://i.imgur.com/6vRkcKJ.jpg (occurred only once to me…)
Yeah… glitches happen… sometimes, you can recover from it while other times, you can’t.
Problems is not only about rifts. It can happen to any enemy. We had same bug with bounty monster - it was unkillable but there was skull on minimap. Therr was no problem with monster spawn but its about monster death. It dies but not die instead is unkillable and does not perform any action.
Also unlike gr boss this was not new spawned monster. Bounty was bound shamam
LoL I never saw that error. Nice one. I am not sure is something wrong with server.
If this happen often for sure problem is on your hardware (network card). Server should kick you from game as player who is off line but is not…so packages still travel between you and server. I suggest install Diablo on another computer with same account and check again.