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Why has speaker fill been removed/disabled on MSI Realtek audio manager with Nahimic 2?

Why has speaker fill been removed/disabled on MSI Realtek audio manager with Nahimic 2? I have logitech X530 5.1 speaker setup, it worked perfectly with enhancement/speaker fill and 5.1 enabled and audio transmitted to all speakers at the same volume on the basic sound drivers (microsoft). This option is removed if installing Nahimic 2.5.12 package and realtek drivers from MSI. Virtual sound option on Nahimic 2 does not bring back the same fill effect and sounds terrible. The hardware obviously supports this option so it is a driver problem with Nahimic 2.
Will a future update bring back this option?

System :Mainboard: MSI X370 Gaming Pro Carbon (bios version 1.5)
CPU : AMD Ryzen 7 1800X
OS: Windows 10 Pro 64-bit Build 15063

Tested with Realtek driver: 6.0.1.8169, Nahimic 2.5.12, Microsoft high definition audio driver 10.0.15063.0