Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Create a new Animator Controller (Assets > Create > Animation > Animator Controller)
3. Double click the newly created Animator Controller to open the Animator window
4. Create a new State in the Animator window
5. Create a new Float Parameter
6. Select the State created in step 4
7. Enable the "Parameter" checkbox for Multiplier in the Inspector window
8. Delete the Float Parameter created in step 5
9. Observe the Multiplier in the Inspector window

Actual results: "New Float" is still visible for Multiplier even though that Parameter does not exist anymore

Expected results: The Multiplier field is reset after the Parameter is deleted

Reproducible with versions: 6000.0.61f1, 6000.2.10f1, 6000.3.0b8, 6000.4.0a4

Tested on (OS): MacOS Silicon Sequoia 15.6.1, Windows 11