The transition cuts abruptly after finishing the transition to this camera when a transition occurs between two virtual cameras, but one of the cameras has the effect disabled, or the tweakable property disabled

How to reproduce:
1. Open the user’s attached “Cinemachine PP Blend.zip” project
2. Open the “2_DisabledEffect” Scene (Assets > Scenes)
3. Enter Play Mode
4. Observe the result

Expected result: Vignette fades in and out smoothly
Actual result: Vignette fades in but instantly disappears after the camera “CM vcam2” to “CM vcam1” transition ends

Reproducible with: 2.9.5 (2021.3.32f1, 2022.3.12f1, 2023.1.19f1), 3.0.0-pre.3 (2023.2.0b16, 2023.3.0a12)
Fixed in: 3.0.0-pre.4 (2023.3.0a12)
Could not test with: 3.0.0-pre.5, 3.0.0-pre.9 (errors after package upgrade)

Reproduced on: macOS 13.5.2 (Intel)
Not reproducible on: No other environment tested

Note: not reproducible when the effect and property are enabled or the effect is missing from the override stack