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Very Odd.  I just updated to the most recent version of Photoshop (26.5.0) and when I open the Levels Adjustment Command the tab function works just fine.

I am using a Mac with Sonoma OS.

I know the behavior of commands can change somewhat depending on Mode, e.g. RGB vs CMYK, vs Lab etc and sometimes bit depth so not sure where the problem lies.

Resetting Preferences may or may not help you.  Another option would be to start the computer up in Safe mode.  Sometimes there are "helper" programs running i the background that interferes with other open programs.

I think I am at the end of suggestion to try since it works on my computer.

Also, I have never seen where it preselects the Adjustment Levels Command to the Black Point so another odditiy that I could not reproduce.

Hope you or someone can figure this one out.  If you find a solution, please post the solution.

John Wheeler