Kutum not visible in second phase

Bug Name:

Kutum not visible in second phase​

Bug Description:

After the first phase of Kutum he's burying itself in the sand. After that he's not visible anymore and I'm unable to attack it. I asked around after the fight and some people have the same issue.

In this image you won't be able to see him, but you will notice that other people are able to see it (since they are able to attack and kill it): https://imgur.com/a/KRqdlKi​

How to reproduce/proof:

Ermmm... go to Kutum, fight him, wait and see. (can create video if that makes it easier)​