Wow, thanks for your analysis, it was exactly my problem! I probably set it recently when I tried to achieve the minimum file size. But this consequence is weird. I would never expected this cause. I was worrying this is a default Inkscape behaviour. I am relieved now

Hello Everyone, I've generated this SVG file programatically and now I want to edit it in Inkscape. When any layer is moved, its shape is simplified to the straight line shape (like point coords would be rounded by larger amount than needed). Is it by a mistake in my file or is there any limitation ...