I ran into an issue last night during mythic shad'har at phase 3 where the large fixate debuff would not display on the targets. I'm assuming this may be due to a limitation of how many debuffs can be displayed on the WoW frame rates at a given time and another assumption is that the frames aren't intelligent enough to prioritize the large debuffs over others.

Anyone else have this issue or can confirm my assumptions above? If so, I'm open to suggestions on how to get past this. I'm not opposed to swapping raid frames, just that the wow frames have suited me for many years.