If something magically broke you out of a fear effect and you have a Shaman in the raid, it's probably Tremor.
The issue in PvE is that in Uldir, you don't get feared if you or your raid plays halfway properly, all fear mechanics are totally avoidable.
In 5man Dungeons you basically have to tell people "Hey, i got tremor, you don't have to LoS this time", in Pugs good players just avoid the fear effect anyway because that's what you usually do.
Tremor doesn't need a visual effect, it needs situations in PvE where the fear effect is unavoidable for certain people or a major hassle to play around it, then people would become aware of the fact that Shaman in fact has something to break a fear / charm / sleep effect.