I can use search query
user:309650 is:q to find all questions of user 309650 (actually it's me).
Now I'm changing this query by adding one more id:
user:309650 user:384512 is:q.
I expect users to be joined via OR, so I want to see posts of both users - me and @Asinine.
But the actual result is only questions of the last user in the list.
I think this logic should be changed.