Pack Tactics weird wording?

I've noticed in reading that in both the monster books I have, Monsters of the Multiverse and the 5.5e Monster Manual, that where everywhere else I see "has Advantage on attack rolls", Pack Tactics says, consistently, "has Advantage on an attack roll". Does that wording distinction have any significance? For example, Jackalweres have Multiattack; does the wording mean that only one of its attacks each turn get Advantage?

Yea every attack roll you make is "an attack roll". 

I think the only significance is that Pack Tactics has a condition that needs to be evaluated per attack. I can't guarantee that other abilities that have conditional advantage per attack follow the same convention, though.