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?
convolution
whiptail
instantiation-error
tinylog
fpic
string-search
data-protection
appstorage
httpsession
strassen
cxf-codegen-plugin
hook-wordpress
go-gin
atomicreference
drf-queryset
semgrep
bitbar
frame-pointer
powerbi-datagateway
qvariant
lfortran
private-network-access
bleu
aws-copilot-cli
anycast
anki
objective-c-2.0
blazor-hosted
activemodel
httpbackend