Here is the issue in Premiere 25 - there is a very slight white "ghost" line between clips   Here is how the borders come back if you expand the track -   And here is how the minimized tracks of the same sequence looked in Premiere 24 ... View more

Boundaries between clips are not visible when timeline tracks are minimized, have to expand the tracks to see the boundary edges between clips.   Version 25.1.0 Build 73 on  M1 Max Mac Studio running Sequoia 15.2 ... View more