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Hi @Michael O,
Thank you for documenting this behavior.
At this time, I could not find a published Microsoft known issue confirming that Windows 11, OneDrive, or Known Folder Move can unexpectedly reset the Camera Roll library to the local Pictures folder. Microsoft documents that Camera Roll normally resides under the Pictures library and may be recreated if it is missing, but the specific behavior you observed has not been officially confirmed.
Regarding whether an update or configuration change could cause this, it is technically possible, but there is currently no official confirmation that this is an expected or known outcome. Based on my initial thoughts and experience, it may result from the Camera Roll library being recreated, inconsistent known-folder registration, or a policy or configuration change affecting the redirected Pictures folder. These are only possible explanations rather than confirmed causes.
I would appreciate it if you could share the steps and screenshots you used to correct the library configuration, as they may help other users experiencing the same behavior.
I think it would be helpful for both of us to continue monitoring this thread to see whether other users report the same behavior or identify a common Windows or OneDrive build. If possible, please also share the Windows OS build and OneDrive version from the affected devices so that others can compare their environments.
Thank you again for documenting the issue and sharing your findings with the community.