Phonos has a kind of "position marker" when playing an audio, that marks, more or less, what is reading. When a RTL language text is added in a LTR Wikipedia, the marker goes from left to right, instead of going from right to left.
You can see the effects of this here: https://en.wikipedia.org/wiki/Israeli_West_Bank_barrier#Names
If the Phonos button is clicked, the slider goes from left to right, even if the texts are in Hebrew and Arabic.