Bug overview description.
You can't make a search that excludes posts uploaded by more than one user. If normal, this behavior is not documented on Help:Cheatsheet
What part(s) of the site page(s) are affected?
Post searches
What is the expected behavior?
A search like "manmosu_marimo -user:circeus -user:delurc" should show posts by neither user.
What actual behavior is given instead?
Only the last negated user's uploads are actually excluded.
Can you reproduce the bug every time?
Yes. Have not tested with other user-related metatags or more complex searches, though.
What steps did you take to replicate this bug?
Perform any search that negates two user:xxx tags. The ordering of other tags does not appear to change anything (e.g. putting normal tags after the user tags.)
Updated by Furrin Gok