Weird anomaly

This morning I reopen the app in development and a menu tab is completely empty.
I check that it is completely disconnected from the collection and reconnect it and I understand that I have to do 4 hours of work all over again, how is this possible?
Is there a beckup of the app, a history?

I am deeply disconcerted by this bug, can you recover the work done?
Thanks in advance to anyone who can answer me.
Paul

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So what does your “Menu” tab do? Is it a collection?

Does this bug affect any of your other tabs?