This is similar to this bug with SSAO: SSAO bug with mirrored objects
Screen space reflections also do not handle mirrored objects correctly: The reflection of the blue box is rendered on the inside here: Babylon.js Playground
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Pinging @julien-moreau for SSR 
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Nice catch!! Fixing ASAP
Will also integrate the new method to render SSR (based on the latest SSAO update)