Notebook in file viewer disappear seemingly randomly


I have one particular notebook that disappears from the file viewer, seemingly randomly. It seems to reappear when I press the save button. This only started happening recently. I went to re-load the notebook from my local storage, but it prompts the “do you want to overwrite the file?” message. I pressed “no”, and the notebook seemed to just re-populate in the file viewer.

I am using the JupyterLab environment. Any ideas why this notebook disappears, only to reappear when I press save?