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?
index-buffer
space
browser-action
moonlight
unchecked-conversion
in-memory-oltp
android-studio-3.2
google-bigquery
treeline
getpixel
tx-gridelements
leshan
toggle
sproutcore
pythonw
nano-sql
routerlink
clsid
amazon-gateway
androidappsonchromeos
oracle-aq
dialogbasedapp
fabricjs2
haskell-ffi
setpropertyactionlistener
loop-invariant
google-webfonts
kotlin-multiplatform
apache-commons-lang3
low-level-io