@ShawnD Hmm this is unfrotunate. I’ve heard of an issue like this existed in an older version but it was fixed over a year ago.
To have better chances to recover a file please follow this guide Pencil2D Project File Corruption Prevention / Partial Recovery Guide
We can try to see what’s inside the file, but if you saved the file while it had the blank frames, it will be impossible for us to recover anything beyond that and your best chance will be to follow the guide (particularly on windows) to find if there’s still elements in the temporary folder of the OS.
I’ll look into your file meanwhile and let you know what I find.