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Dear Christopher,
Thanks for your updates and confirmation.
I just refresh the page and it seems that I can reproduce the issue in our environment. The title of the page may not be changed immediately but it will become the original list name after some time.
I think that it may be something source code issue in the web part and I'm afraid that the issue may involve the related team to be fixed directly.
I suggest you contact the administrator in your company or organization and let him open a support ticket to our related team as soon as possible by the steps in the following article.
Get support - Microsoft 365 admin | Microsoft Learn
How do I find my Microsoft 365 admin? - Microsoft Support
Sorry for that our category may have limited resources on further fixing the issue from our side.
Thanks for your understanding and have a nice day!
Sincerely,
Cliff | Microsoft Community Moderator