When I select multiple images in lightroom and hit "open as layers in photoshop", photoshop launches and opens the first couple images and then stops opening the remaining images. It leaves a layer called "load images" at the bottom of the image stack.
Often if I close the file, and try again, it will work the second time. This has been a repeated issue for several years. I manage a facebook group for architectural photographers with 3.5k members and this issue is regularly brought up.
I'm currently using PS 22.5.0 and lightroom Classic 10.4 on a iMac running Big Sur 11.5.2.