Lightroom directories disappearing from the library module

Lightroom 14.5 Build[202508061311-4cef2162]

OS Name Microsoft Windows 11 Pro
Version 10.0.26100 Build 26100
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name MEGALITHIC
System Manufacturer Dell Inc.
System Model XPS 8960
System Type x64-based PC
System SKU 0BC0
Processor Intel(R) Core(TM) i9-14900K, 3200 Mhz, 24 Core(s), 32 Logical Processor(s)
BIOS Version/Date Dell Inc. 2.18.0, 6/30/2025
SMBIOS Version 3.4
Embedded Controller Version 255.255
BIOS Mode UEFI
BaseBoard Manufacturer Dell Inc.
BaseBoard Product 09M47G
BaseBoard Version A00
Platform Role Desktop
Secure Boot State On
PCR7 Configuration Elevation Required to View
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume4
Locale United States
Hardware Abstraction Layer Version = "10.0.26100.1"
User Name Megalithic\thoma
Time Zone Mountain Daylight Time
Installed Physical Memory (RAM) 64.0 GB
Total Physical Memory 63.6 GB
Available Physical Memory 43.0 GB
Total Virtual Memory 72.1 GB
Available Virtual Memory 37.1 GB
Page File Space 8.46 GB
Page File C:\pagefile.sys
Kernel DMA Protection On
Virtualization-based security Running
Virtualization-based security Required Security Properties
Virtualization-based security Available Security Properties Base Virtualization Support, Secure Boot, DMA Protection, UEFI Code Readonly, Mode Based Execution Control, APIC Virtualization
Virtualization-based security Services Configured Hypervisor enforced Code Integrity, Kernel-mode Hardware-enforced Stack Protection
Virtualization-based security Services Running Hypervisor enforced Code Integrity, Kernel-mode Hardware-enforced Stack Protection, Hypervisor-Enforced Paging Translation
App Control for Business policy Enforced
App Control for Business user mode policy Off
Automatic Device Encryption Support Elevation Required to View
A hypervisor has been detected. Features required for Hyper-V will not be displayed.

My typical workflow is to upload my images to a directory on my Synolog NAS. Then edit and save them to a new directory on the same drive. The NAS has about 16TB of total storage in total  and in that I have used 4TB, I have 33,379 images stored.

The directory structure is as follows:

-decade (eg. 2020)

    -year

        -client

            -event

This morning I went looking for some images only to find that the events were missing from the "Library." This occured in roughly six "event" folders under different clients.

The actual directories were stored correctly in the Windows OS and what I had to do was "import" the images from their correctly stored locations back into Lightroom. When I did reimport the images they had retained the Lightroom adjustments I had previously made.

Hopefully it doesn't occur again as it killed two hours in my day.