masking tool is no longer detecting people in images. Was working earlier this week, now it says "no people found"

Your Help > System Info didn’t get posted here. You can do that menu command, click the Copy button, and then paste the text here.

Lightroom Classic version: 15.3 [ 202604090947-8f3672ed ]
License: Creative Cloud
Language setting: en-US
Operating system: Mac OS 26
Version: 26.5.0 [25F71]
Application architecture: x64
Logical processor count: 16
Processor speed: 3.8GHz
SqLite Version: 3.36.0
Adobe GSDK Version: 1.4.0.213

Built-in memory: 32,768.0 MB
Dedicated GPU memory used by Lightroom: 5,534.3MB / 8,176.0MB (67%)
Real memory available to Lightroom: 32,768.0 MB
Real memory used by Lightroom: 7,698.4 MB (23.4%)
Virtual memory used by Lightroom: 82,030.7 MB
Memory cache size: 5,899.8MB
Internal Camera Raw version: 18.3 [ 2527 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 4873MB / 16383MB (29%)
Camera Raw real memory: 5790MB / 32768MB (17%)

Cache1: 
Final1- RAM:689.0MB, VRAM:2,538.0MB, Gretchen_James May 2026-431.DNG
Final2- RAM:289.0MB, VRAM:0.0MB, Gretchen_James May 2026-589.DNG
NT- RAM:978.0MB, VRAM:2,538.0MB, Combined:3,516.0MB

Cache2: 
m:5,899.8MB, n:541.1MB

U-main: 324.0MB

Standard Preview Size: 4096 pixels
Displays: 1) 4096x2304

Graphics Processor Info: 
Metal: AMD Radeon Pro 5500 XT
Init State: GPU for Export supported by default
User Preference: Auto
Enable HDR in Library: ON
GPU for Preview Generation: Auto (S5_7)

Application folder: /Applications/Adobe Lightroom Classic
Library Path: /Volumes/WD 12 TB 1/Lightroom Classic/Lightroom Classic-v13-3.lrcat
Settings Folder: /Users/GheeGhee/Library/Application Support/Adobe/Lightroom

Installed Plugins: 
1) AdobeStock
2) Aperture/iPhoto Importer Plug-in
3) Flickr
4) Topaz Photo (Studio)
5) Topaz Photo AI

Config.lua flags: 

Same, I am getting this as well. Very frustrating.

Please do the LR menu command Help > System Info, click the Copy button in the upper right corner, and paste into your reply here, so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set.