1、delete all reflection capture, leave only a movable skylight in the map
2、create a sphere mesh with roughness 0.01, metallic 1.0, basecolor white
3、the reflection on the mesh will look blurry on Android devices(Snapdragon SOC specifically) while very sharp in the editor es31 preview
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-115484 in the post.