The Jira Issue/Filter macro cannot handle JQL queries that includes special characters like swedish characters (å, ä, ö and such).
E.g. this query:
assignee="Marie Tilja" works fine
while this query:
assignee="Jonas Sääv" does not work
Both queries work fine in the Jira Issue/Filter dialog:

but when the filter is rendered for assignee="Jonas Sääv" on the confluence page it looks like this:

However for assignee="Marie Tilja" I get a proper output:

The bug applies also to other properties like labels
I created two labels "label" and "läbel"
The same issue as above arises for the JQL queries:
labels in ("label") works fine
labels in ("läbel") does not work