Originally published at: Pixelmator Pro 3.3.7 - TidBITS
Photo editor introduces new Frequency Separation and Low Pass effects. ($49.99 new, free update, 574 MB, macOS 11+)
Mine is showing ver. 3.3.8 (Mosaic)
Looks like that was a late, quiet change. There are no release notes for it on the company’s page, but the Mac App Store says:
Fixes in Version 3.3.8
• In some cases, unwanted artifacts would appear in images after exporting them to a custom size. Fixed.