Glitch in Photos when cropping in edit mode (Macbook Pro)

I did not read through all the comments, so I hope I'm not being repetitive here.

I have been online and on the phone with Apple, and they gave me a workaround for the issue for now. They are working on the problem, and hope to have a Photos update (possibly) sometime this fall.

Take the photo with the messed up thumbnail, go into Edit and hit rotate ONCE. From there, push Control and hit the rotate icon again, once, to reverse the image back. It worked great for me on the photos I had issues with. I have had problems with photos taken with both of my Canon Rebels, my iPhone photos that were air-dropped, as well as photos that were imported from a back-up hard drive.

Hope the workaround gives you some results until we get the new version. I miss iPhoto! :-(