This looks more like random placement instead of even attempting to put the seam on the corner. The model was printed with the flat side at the bottom in the picture facing the front of the bed, so the corner that is to the rear in the picture would have been at the rear of the print.
I know it's not possible to make the Z seam disappear completely, particularly on a three wall print, but honestly, this looks like Cura not even seeing the "sharpest corner" setting.
On an unrelated note, what do I have to do to be allowed to post without approval from a moderator?
Cura is not always very successful in finding the sharpest corner. For whatever reason, but that's one reason why you see the Z-Seam.
The Hide Seam setting doesn't mean that the Seam is hidden so you can't see it anymore. It only tries to put the Seam inside so that it is no longer visible on the outside. If you now have no "inside", then the setting is of no use.
With the Z-Seam it is always better if you manually specify where it should be, then you can either "hide" it or place it in a place where you can easily sand it away.
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