I just reported a bug that I think it's an important one, there are transparent pixels in scenes where there should not be a single one:
Here is the report, with example scene and renders:
https://github.com/LuxCoreRender/LuxCore/issues/536
To repro just open the scene and render.
Bug - Fully transparent pixel-sized-holes in alpha channel in fully opaque render
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Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.