P: Sky Replacement menu (skies do not brighten using slider but all other slider functions are reliably working)

Photoshop Beta 27.9 - When invoking the Sky Replacement module (Edit > Sky Replacement) the brightness slider is not functional, although it moves freely, there is no visible change in the preview, nor is any brightness to the sky visible when applied.  All other slider functions within the Sky Replacement panel function normally. The same feature (sky replacement brightness slider) works normally in non-beta version of Photoshop v 27.8.