How to recover an edited photo after accidentally removing it from Favorites in Photos app on Mac?

Hi. I spent about a half-hour editing one of my favorite photos in the "Photos" app. Specifically, Photos v. 10.0. Sequoia 15.3.2 on a Macbook Air 2020 M1. This was one of many photos I had selected as "favorite" with a "heart" icon, and it was in the "favorites" file. After making adjustments to tone, sharpness, cropping, etc. I clicked on "Done." And then, for no discernable reason, I clicked on the "heart" icon - inadvertently deselecting it as a "favorite." No problem, I thought - I'll just go back to all photos and find that particular one with the exact date. And there were all the photos I took on that date - including a few of the same subject. But NOT the one I had edited. I searched for another hour - I mean, a really thorough search. GONE. Any ideas?

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