Seam artifacts appear in Pattern Fill when using rotation (angle), and become more pronounced when combined with 80% scaling.

Product and version : Adobe Photoshop 27.1.0

Operating system : Windows 11 Professionnel

Steps to reproduce :

• Create or open a seamless texture (e.g. 4096×4096 px, generated in Substance Designer or equivalent).
• Define the image as a pattern (Edit → Define Pattern).
• Create a new document.
• Add a Pattern Fill layer (Layer → New Fill Layer → Pattern).
• Set the following parameters :
  • Angle: 135°
  • Scale: 80%
• Observe the pattern seams at tile boundaries.

Expected result : The pattern should remain perfectly seamless regardless of rotation angle or scaling, with no visible artifacts at tile boundaries.

See image : pattern_80_0_no artefact.png

Actual result : Subtle seam artifacts appear at tile edges when using rotation (e.g., 135°) at 100% scale, and become more pronounced below 100% scale.

See image : pattern_80_135_with artefact.png

See image : pattern_base.png = Source pattern used

Thank you for your help :)