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Thanks for reporting this behavior, I have noticed several users who also face the similar situation as yours.
Some of discussions have the same unexpected issue:
- Anyone else having problems viewing shared calendars in outlook today? - Microsoft Q&A
- Shared Outlook Calendar has disappeared - Microsoft Q&A
However, I have not found any official document from Microsoft addressing this behavior. What you can do now is go to the shared calendar > remove the affected user> add that user again. The user will receive an invitation email to your calendar again, tell them to accept it.
I know this is inconvenient but for now, please use it as a temporary workaround. I will update you if I have any new information.
Thanks for your understanding and I apologize for this inconvenience.
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