UnityEvent listener execution state is Off by default

Reproduction steps:
1. Open the “OffByDefault” project
2. Open the “SampleScene“ scene
3. Select the “Test” GameObject
4. In Inspector click the “+” button to add a listener the “TestEvent” UnityEvent
5. Observe the execution state (top left) of the added listener

Expected result: the state is “RuntimeOnly“
Actual result: the state is “Off“

Reproduced in: 2022.2.0a9, 2022.2.7f1, 2023.1.0b5, 2023.2.0a3
Not reproduced in: 2020.3.45f1, 2021.3.19f1, 2022.2.0a8

Reproduced using: macOS 13.0.1 (Intel), Windows 10 (by the reporter)