reproduce:
1. create a world with deferred rendering enabled with Minecraft preview ( with reflections enabled )
2. add a resource pack/pbr pack with proper reflection maps on blocks

observed:
Screen space reflections will reflect the entire skybox regardless of whether or not it should from the position of the sun. Most visible with water reflections from the sun (like the screenshot) ignoring the fact that all blocks are reflective, that is tracked by MCPE-179653. unless there are blocks above it then screen space reflections don't work at all (which is a different bug and acknowledged by MCPE-185094).

You can see it reflecting the sun even though the sun should not be reflected because it is behind the blocks, unlisted video: Incorrect SSR skybox reflections (youtube.com)