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Dear Ronni,
Good day!!
Apologies for the inconvenience caused and please don’t worry, let’s work together on your concern and move towards a resolution path.
I understand your concern and I would like to convey that I have tested the behavior at my end in the SharePoint Online list by adding the items in the Edit in Grid View, where the items are not getting save unless I click on Add New Item and adding the content in the Notes is not saving the item.
In this situation, I would like to confirm whether you are observing the same behavior when you edit the list items in the Grid View by accessing the list in the InPrivate or Incognito window of the browser.
If still the same issue happens, I would like to confirm whether the same problem happens when you try even after adding 3 or 4 items in the Grid View at the same session.
If the same problem happens at every session of the edit, we sincerely apologize and I believe the problem should be further investigated by related development team via collecting HAR logs because there is no any related service incident reported at the Microsoft Service Health dashboard.
So, I request you to connect with your IT admin of your organization (How do I find my Microsoft 365 admin? - Microsoft Support) and ask them to raise a new service request from the Microsoft 365 admin center so that the related development team will connect with you and investigate the issue further.
Reference: Get support - Microsoft 365 admin | Microsoft Learn
Note: We apologize for redirecting you to related development support team because the moderators in this community are limited with the resource for further investigation and to get a quick resolution to your problem, we requested it.
Appreciate your patience and understanding. Have a great day!!
Best Regards,
Sophia