Still having great fun with the game! I played some more after my last review and wanted to make a new post solely for bugs--
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Sometimes sewing seams puts the fabric on the wrong side and clips through the machine. I have been able to replicate it on a different dress with the same skirt (the 3-tiered skirt, number 6). It might be exclusive to the right side middle-tier seam of this skirt, but I have been able to replicate it several times. Not sure if sewing order affects this bug or not

Sewing works normally though; the bug is visual only.
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Sometimes (but maybe not always?), clicking out of the cutting table while arranging pieces and then into the sketchbook will show the pattern pieces below/around the sketchbook:

The same thing happens with the sewing machine:

But again, these are just visual bugs and don't cause any real game issues.
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One bug I haven't been able to replicate since it happened is related to above--while laying out pieces to cut and going back to look at different things (dress form, sketchbook, etc), returning to the cutting table caused the uncut pattern pieces to duplicate in the inventory every time, stacking. While experiencing the bug, I was able to drag the duplicated pieces onto the fabric and continue laying them all out (though I did not try cutting them), and then change screens/return to the cutting table to continue duplicating the piece.
I haven't been able to recreate it since then, as placing a piece + changing screens + returning now correctly removes the originally-placed one from its placement on the fabric after dragging it in from the inventory (or removes the image from the inventory immediately when you move the already-placed one, because it recognizes it being the same piece). When I was experiencing the bug before, I was able to continue placing more of the same pattern pieces without them disappearing from the fabric/inventory.
I know that when I originally experienced that bug, I had multiple pieces laid out across different fabrics at the time.
I will update this post if I encounter any more minor bugs, or if I find more details on replicating the last one.
Thank you!