The main problem is, that due to reason that we don't have False9 any more to help the midfield area, Pep had to change the tactics and that's how LB / Cancelo position got killed..
Bernardo had to be moved even deeper and etc.
This means that we have more weakness in the defending areas, than during the previous number of seasons..
This has to be balanced either by moving back to False9 system, which is impossible due to Haaland, or have more energetic and workaholic midfield players, who can cover the zones and like "die on the pitch" for every fucking inch or centimeter.
Unfortunately Gundo is 33 and KDB 32, they can't do that.. Which means that Either we score a lot or we we will have such problems in every game..
What Pep could have done today, was to remove Gundo or KDB after 60 minutes and play Phillips to cover the zones, but he didn't and Forrest used that, which resulted us the goals..
In overall that's the only way with Haaaland, but to have Haaland - we need young and energetic midfielders, Gundo and KDB together, isn't gonna work