Making a query that searches in multiple milestones


I’m not sure if this functionality is available or if I’m doing something wrong, so here it goes.
I have a GitHub project where new issues are triaged by assigning them to a specific milestone. What I want to do, is to make a query that would bring me all the issues updated by 2 users in a week from all milestones used on the project to show the triage effort.

I’ve tried adding more milestones like “milestone:1 milestone:2” but the results were fetched just from the first milestone, no matter what combinations I did.
I know this can be done for labels, and recently even with a simple comma, but it doesn’t seem to work for milestones.

Is there a restriction to filter only one milestone per query?

Thanks in advance,