Hey @VMwareN0ob,
I believe I found the root cause for the misbehaving registry value DisableThumbnails
[HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
It didn't make any sense, all group policy settings for thumbnails are under the user configuration. However, the only way its regenerating is if its defined in group policy on the machine configuration. Yet, there is no listed policy setting.
Well, turns out you don't need a definition, the OSOT had updated the local machine policy file, C:\Windows\System32\GroupPolicy\Machine directly and dropped this in there:
Computer
Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
DisableThumbnails
DWORD:1
This is causing the registry key to continue regenerating. I'm attaching a screenshot, with the specific OSOT setting. You have two options, one is update the OSOT template and set value to 0. Second option is the below blog post, which walks through using lgpo.exe (MS Utility) to update the policy file.
How to individually modify and deploy local GPO settings (LGPO) - Brooks Peppin's Blog
I did test out lgpo.exe but if you are in the position of just changing the OSOT template. I would go that route for simplicity.
