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It is not really meant to be scaled down. Currently hair have thickness of 0.6mm and height of 0.2mm. If you scale it down for 50% that gets you thickness of 0.3mm and height of 0.1mm. This might be hard for slicer to detect. Also thickness of sacrificial wall changes from 0.6 to 0.3mm.
Maybe if you are trying to make a small one try printing it with 0.1mm layer height (and maybe play with detect thin walls settings in slicer)?