Folders missing without any delete activity

We are using Nextcloud 19. All of a sudden, we saw all the data was missing from folders on a specific directory. We tried checking activity logs and no logs were found that shows delete activity. We are unable to track that what had happened that caused missing of folders.
One thing we noted that there was a file created on the folder on the particular day when the data was not there.

Did anyone face this issue before? If yes, could you please share the details related to this.