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I too have been plagued with this issue. I will also download the beta and install it. I also have this issue with thumbnails going on since the last update: https://photos.app.goo.gl/q8IE6F6kDvBg0hpy2
 
Last night I was selecting photos from over 1,000 (using purple) and when I moved the slider all the way back to the front, it lost about 100 out of 140 I had selected. Just gone. I had to take a break at that point.