Can't remember which match it was I was watching but 2 minutes into a 3 minute additional time at the end of the match someone had a cut on their head or simila

Can't remember which match it was I was watching but 2 minutes into a 3 minute additional time at the end of the match someone had a cut on their head or similar, at least a minute of play was lost but the ref added about 20 seconds additional time. Seems really unprofessional not knowing much much time is actually going to be played, especially at such an important tournament. Seems to be abused to, after the 90 minutes there seems to be a lot of pointless substitutes where the player walks off nice and slow to eat up time.