I have found you posted one (1) WHO metanalysis that filtered out 10 studies for Influenza (not Covid) that did not pull out N95 masks and looked at (probably cloth) mask studies of students in residence halls and people in their homes. Those situations would be wildly uncontrolled. They had no way of showing compliance and yes, if someone is not wearing their mask most of the time when it might be protective, it might not be protective.There was 17 studies in the WHO link and ten in the cdc links I posted earlier.
The one (1) CDC metanalysis (again 10 studies) link you posted concluded this: "We did not consider the use of respirators [N95] in the community."
Please share controlled studies looking at N95 masks to show that they don't work. A metanalysis is not a controlled study.
Please don't ask us for controlled studies until you come up with some of your own.