As I cannot see any reference on how to use properly the sysparm_query_category, may I confirm on how did you append the sysparm_query_category in get request?
genfromtxt
undefined-index
function-approximation
php-parse-error
netlify
solr.net
activity-monitor
async-components
xcode9.2
microsoft-unit-testing
responsivevoice
android-work-profile
vi
.git-folder
opencms
tfs-migration
libssl
applocker
idfa
simple-realtime-server
pyzmail
sbt-release
recursive-templates
flutter-file
opendkim
gbdk
sfml
formal-verification
moodle-mobile
multiple-tables