This is not a Photoshop bug and a moderator should move it to "discussions".
File corruption is always caused by failing hardware - a failing drive, bad RAM, wobbly cables or connectors, or a power outage in the middle of a save.
This is why we all make backups, and save incrementally during work.
You can try the various recovery software available on the web, but don't expect miracles.
"Various" means "more than one". You might use a search engine to find one, but start here with Adobe Help. A couple are listed, plus there is a lot of good information on prevention.
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