In my project, but reproducible with the provided playground from the documentation: https://playground.babylonjs.com/#WGZLGJ#3348
The transparent objects are not visible with:
scene.useOrderIndependentTransparency = true;
It can be reproduced on some mobile devices (tested to not work on iPhone 13, Samsung S20FE, Poco M4Pro) and works on Samsung S8 and S7 (just with a strange z-clipping).
I tried as well on the https://appetize.io/ online mobile simulator, and it is reproducible the same with proposed mobiles.