Keyboard shortcut for Previous Keyword Set doesn't work on US numeric keypad
The Previous Keyword Set command is assigned to Opt/Alt Shift 0, which works if you type 0 on the main keyboard but not on the numeric keypad.
Tested on LR 13.0.1 / Mac OS 13.5.1 and Windows 11 / LR in English / Physical US English Keyboard and on-screen keyboards in Mac and Windows.
1. In Library, select a photo.
2. In the Keywording panel, make sure at least three keyword sets are defined.
3. Type Opt/Alt 0 on the main keyboard and then on the numeric keypad, and observe the next keyword set is correctly selected in both cases.
4. Type Opt/Alt Shift 0 on the main keyboard and observe the previous keyword set is correctly selected.
5. Type Opt/Alt Shift 0 on the numeric keypad and observe that on Mac, the next keyword set is selected and on Windows the keyword set doesn't change, both incorrect behaviors.
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To open the Mac keyboard viewer:
a. In System Settings, search for "Show input menu in menu bar" and then set that option.
b. In the menu bar, click US and then Show Keyboard Viewer:

c. If you don't see the numeric keypad, do ... > Custom Panels > Keyboard - ANSI (Large):

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To open the Windows keyboard viewer:
a. In the Windows search box, search for "on screen keyboard" and run the On-Screen Keyboard app.
b. If you don't see numeric keypad, click the options key:

and check Turn On Numeric Key Pad.
