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Hi Ryan,
Thanks for posting back.
According to your reply, the problem still happens when copying the content to a new notebook and it happens on multiple devices. Since you have already tried many steps, to troubleshoot it further, please contact your admin or IT department to raise a support ticket via Microsoft 365 Admin Center> Support> New service request. That support team there will have the correct channel and resources to collect the log files from your side and find what exactly reason has caused this problem.
Sorry for the inconvenience that happened to you. Appreciate your understanding and patience.
Sincerely,
George | Microsoft Community Moderator