This happens to me all the time. Either it wont display the LUT within Premiere, or when I export it wont have it applied. Sometimes I put a LUT ontop of the existing one as a clip effect and the next time I open Premiere its back to working so I then have double the LUTs on. It’s seemingly random, I havent been able to identify a way to trigger this bug. Maybe due to too many LUTs on too many clips? I wish there was a way to import the media without automatically applying the LUT.