Hi are these PNG images, if so uncheck these options as a temp fix, restart Photoshop, hopefully Adobe will have a fix soon
YES! Thank you so much, Ged! That worked. I hadn't noticed the fact that all the files were .pngs.
This problem should be fixed after the Photoshop 19.1.2 update. You can install this update via Creative Cloud desktop app.
Also, you can refer the list of the fixed issues after the Photoshop 19.1.2 update, here: Fixed issues in Adobe Photoshop CC
Glad to see this is getting fixed. It's really annoying!