UnityEvent Inspector retains argument field after switching the function to a different variant

Steps to reproduce:

1. Open the "StaleArgument.zip" project
2. Open "SampleScene"
3. Select the "UnityEventStaleArgRepro" GameObject
4. In the Inspector, in the function dropdown select UnityEventStaleArgRepro > SetValue (at the top of the list)
5. Observe the float field below the dropdown

Actual results: the float field is still visible

Expected results{}: the float field is hidden

Reproducible with versions: 6000.0.0f1, 6000.0.75f1, 6000.3.16f1, 6000.4.8f1, 6000.5.0b9, 6000.6.0a5

Reproducible on OS: Windows 11 Pro

Notes: 

• Refreshing the Inspector updates the float field
• Reproducible with every other type besides float (int, string, etc.)