To reproduce:
1. In URP Global settings, change the Light Layer name;
2. Check if the light layer name is correct in Directional light dropdown for Light Layers;
3. Undo the name change;
4. Look at the light layers dropdown in Directional Light again.

Expected result: you can undo the light layer name in Global settings and the name also changes in the game objects Light Layer dropdowns.
Actual result: after undoing light layer name is changed in the Global settings but is not changed in the dropdown of game objects light layers.

Note: Only tested URP.