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I wonder why a do not get a sharp result when erasing with a brush and get a dark contour when turn the brush 90 degrees. The working layer is transparent. In the middle there are two brushes drawn with the pencil tool. On the left the one brush is turned 90 degrees and there is a dark boundary around it. When I use both brushes to erase a line, then erasing is not pixel sharp.Do I miss something or is it a bug? Thanks for your answer in advance.
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Just a suggestion.

Make your brush black / white and as a clipboard brush use the mask option which then takes the FG colour.

For erasing enable the hard edge option

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rich, thanks for the reply. I was forgotten about the 'hard edge' option in the erase tool. I've solved the 90 degrees turn by making 4 brushes (0, 90, 180, 270 degrees). I only need this positions.