resulting DNG from enhance (AI denoise) not showing up as stacked overlay

I am using Lightroom version 7.2 on a Windows 11 PC (system info below) using Fujifilm XT-4 RAF (raw) files.

I have mostly had success using the AI denoise function, creating a stack. However, with some files, the system goes through its 5-7 minutes denoise operation, but no denoised DNG is stacked on the original. I've discovered that I can go into a deeply buried Windows subdirectory "C:\Users\..\AppData\Local\Adobe\Lightroom CC\Data\03403ce712c14965bb82d7e8c980ce33\originals\" and find the denoised DNG file that was created, but it never shows up in Lightroom, even after waiting a day or so. Any ideas on what is going on or how to get the denoised DNG to stack?

Thanks

Lightroom version: 7.2 x64 [ 20240214-0910-27200e9 ] (Feb 14 2024)
NGL Version: 1.36.0.9
WF Version: 6.2 3d4e7aa
VF Version: 1.0.135.7
HIL Version: 40409
CAI Version: adobe_c2pa/0.7.6 c2pa-rs/0.25.2

Operating system: Windows 11
OS Version: Windows 11 Home (2009)
Application architecture: x64
System architecture: x64
Computer model: LENOVO 81TC / Intel(R) Core(TM) i5-10210U CPU @ 1.60GHz
Logical processor count: 8
Processor speed: 2.1 GHz
Built-in memory: 7988.4 MB
Real memory available to Lightroom: 7988.4 MB
Real memory used by Lightroom: 541.4 MB (6.7%)
Virtual memory used by Lightroom: 14114.7 MB
Memory cache size: 35.0 MB

Internal Camera Raw version: 16.2 [ 1763 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 711MB / 3994MB (17%)
Camera Raw real memory: 190MB / 7988MB (2%)

Display: 1920x1080
System DPI setting: 144 DPI (high DPI mode)
Desktop composition enabled: Yes
Input types: Multitouch: Yes, Integrated touch: Yes, Integrated pen: Yes, External touch: No, External pen: No, Keyboard: Yes

Graphics Processor Info: DirectX: Intel(R) UHD Graphics (27.20.100.8729)
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\kirke\AppData\Roaming\Adobe\Lightroom CC
Library Folder: C:\Users\kirke\AppData\Local\Adobe\Lightroom CC\Data