It seems that the definition of precision highp float / mediump on iOS has changed recently.
The same behavior was not seen before on iPhone6S, iOS13. If I remember correctly.
The Chapter of Random
For example, the above site is displayed in black on iPhone 14 mini and iOS14, but it is displayed correctly when I change mediump to highp. Also, if I reduce the number of digits enough, it shows up too.
I couldn’t find a similar post in the forum, so I’ll share it.
I haven’t been able to determine if it’s the OS or the hardware that’s causing this. Does anyone have more accurate information?