Its okay if you save the epub and reopen later and kerp the software running but if you do not save and reopen and just leave the epub open in Sigil for a week or more, you will have your /tmp files deleted out from under Sigil. This is expected behaviour on macOS and they do warn developers about it. There is a plist setting to change the time period before the auto-clean. Perhaps you have it set for something longer or it now defaults to something longer.
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