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Dear webbrewers,
Thanks for posting back.
Based on my search, I am afraid I didn't find any related information. Since the situation only happens in this library, I would like to suggest you create a support ticket about the situation via Microsoft 365 Admin Center> Support> New service request. That support team there will have the correct channel to help you investigate more and find what exactly the reason has caused this issue.
Sorry for the inconvenience that happened to you.
Sincerely,
George | Microsoft Community Moderator