iTunes gapless playback issue on macos

I’m using ITunes on my MacBook Pro M1 and have discovered that some albums (example, Abbey Road by The Beatles) now have gaps between songs where should not be a gap (I.e the original album had 2 or 3 songs strung together as though they were one song).

There used to be an option to select which songs should be gapless if ITunes didn’t automatically recognise this but it seems to have disappeared.

Any help would be greatly appreciated. Thanks