In this example - my understanding is that every bar has four quarter notes, in the third bar, we can see only two eighth notes connected to a half note - does that not make a total of 3 quarter notes? The left hand part has a whole note - so that is okay - correctly equal to four quarter notes for that bar. But in the treble clef part for that last bar, shouldn't there be a quarter rest? (or is that supposed to be optional if the rest is in the end?)
This notation is from a published source - https://krishnadasmusic.com/products/krishna-das-selected-sheet-music-vol-1-digital