Answered
Photoshop Beta - Adjustment Layers in LAB color not working
Several adjustment layers, including curves, are not working in the latest Phgotoshop Beta version in the LAB color space.
Several adjustment layers, including curves, are not working in the latest Phgotoshop Beta version in the LAB color space.
There seems to be a problem with the menu, I have requested a fix.
Until then you can add it from the Adjustments panel.

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