I've been doing some recap of songs I've used to study a while ago and tried to concentrate on improving my left hand finger independence. I've stumbled upon a study by Carcassi which can be found in Thorlaksson's Guitar Method 1 at page 10 https://classical-guitar-school.com/en/Files/1038.pdf
I think the chord that is causing me problem is by the 10th measure where B is in the bass and D in the higher voice, G being the pedal note. I've noticed that when 2nd and 4th finger have to play the 3rd being free tends to pop out and of course 3rd and 4th being the least independent pair this tenses the 4th finger making it unstable and sometimes touching the free G string which has to ring. How can I fix that?