Steps to reproduce:
1. Open new project
2. Create Audio Mixer
3. Create 2 groups in the Audio Mixer
4. Add "Receive" effect on one and "Send" effect on the other
5. Select the group with "Send" effect
6. In the inspector, change the Send level from -80.0 dB to 0.0 dB
7. Observe the slider on the effect in the group in the Mixer window not changing as well

Expected result: Send level slider should be the same for both places - The inspector window and in the group in the mixer window
Actual result: Inspector slider does not function, only the one in the group in the mixer window actually changes send levels

No Repro 2018.3.12f1, 2019.1.0a8, 2019.1.0a11
Repro: 2019.1.0b1, 2019.1.0b6, 2019.1.0b9, 2019.1.0f2, 2019.2.0a11 (trunk)