Boss stuck outside of fighting range

During the boss fight (Ashar, the sand mother) the boss went stuck outside of the wall which was out of fighting range and never get unstuck.

I've wasted my whole day to get to floor 3 boss of the Sekhemas trial and ended up with this issue, and this is not the first time this happened. It's so frustrating because this trial is very difficult and needs so much effort, how am I going to progress to floor 4 If it's being like this?

Wasting my time and my trial coin for nothing. Please fix it asap or at least a compensation.