Recently I noticed very visible large block-like artefacts in the sky. These artefacts are present on some pictures, but not on all, and they are already present in the photos before editing them
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I took some more shots and finally found out what's causing the artefacts: the
digital zoom. All the pictures that are taken without zoom are ok, and most (but not all) with any level of zoom have these artefacts.
The Huawei P10 actually has, what it calls,
2x Hybrid Zoom, a digital zoom which is supposed to allow the level of detail of an optical zoom up to a level of 2x, by the means of two separate lenses. I don't know exactly how it works, but there seems to be something messed up in the current implementation.