P: B&W Mixer Auto does not adjust sliders

When auto is selected for B&W mixer no sliders are adjusted.

Lightroom version: 8.1 x64 [ 20241205-0700-3674d7f ] (Dec 4 2024)
NGL Version: 1.39.0.9
WF Version: 7.1 8eff0d6
VF Version: 1.0.154
HIL Version: 40501
CAI Version: adobe_c2pa/0.9.3 c2pa-rs/0.31.0
PH Version: 5.0

Operating system: Windows 10
OS Version: Windows 10 Home (2009)
Application architecture: x64
System architecture: x64
Computer model: Dell Inc. XPS 8500 / Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
Logical processor count: 8
Processor speed: 3.3 GHz
Real memory available to Lightroom: 16344.9 MB
Real memory used by Lightroom: 3376.8 MB (20.6%)
Virtual memory used by Lightroom: 4561.8 MB
Memory cache size: 0.0 MB

Internal Camera Raw version: 17.1 [ 2098 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX
Camera Raw virtual memory: 1152MB / 6124MB (18%)

Display: 1920x1200
System DPI setting: 120 DPI
Dark Mode: No
Desktop composition enabled: Yes
Input types: Multitouch: No, Integrated touch: No, Integrated pen: Yes, External touch: No, External pen: Yes, Keyboard: No

Graphics Processor Info: DirectX: NVIDIA GeForce GTX 660 (30.0.14.7506) - 1496 MB
Graphics Processor Detail: loaded: Yes, supported: Yes, compute: No, init: I2_GPU2, hard: fail_cached_sanity_test, soft: not_checked, al: No, dl: No
OS Media Capability: true

Application Folder: C:\Program Files\Adobe\Adobe Lightroom CC
Settings Folder: C:\Users\Steven\AppData\Roaming\Adobe\Lightroom CC
Library Folder: C:\Users\Steven\AppData\Local\Adobe\Lightroom CC\Data