Quick Export As PNG with an indexed color image with translucency writes white pixels to output.

[Birdlay]

In Photoshop 2023, using Quick Export As PNG with an indexed color image with translucency enabled outputs white pixels in the transparent areas. This is a regression from Photoshop 2022, where the pixels are correctly written as transparent.

[Bojan Živković]

Save for Web is an option to export with transparency. You can record Photoshop action that can be trigerred using keyboard shortcut.