During the setup of a "new" laptop I had to learn, the Software Defined Wand (SDW) of my NutEm/PC will work by chance only (if at all), or in very few rare cases. It turns out that an important option was set coincidentally on all my old machines. Without it, barcode scanns prepared for analysis will look like following example (enlarged clipping). My SDW is inapt to disentangle such "crocheted borders".
Edit: the statement above should be changed to past tense, since this bug (and also another one) is fixed in update with timestamp 2023-08-31.