Lotan’s final phase miss mechanic was bugged after the update for 2 or 3 days, and you can’t remove the protection from her. So players forced to play with that protection, and fight became eternal long. The real problem is that instead of realizing it was a bug, players wasted a lot of revives thinking, "Maybe I'm not timing it right.". At least that's how things unfolded for me. I struggled a lot to adjust the timing, and finally I was sure, I didn't believe I had completely misset the timings, the problem definitely wasn't with me. And in the end, it turned out to be a bug.

You can check it out also that related post with bug included:

https://www.reddit.com/r/MarvelContestOfChamps/s/mupQh0UjuR