in cb6 interceptdata argument is changed to data
https://coldbox.ortusbooks.com/intro/release-history/upgrading-to-coldbox-6#interceptor-arguments-interceptdata-greater-than-data
So for cb6 the interceptors should have a different method signature, so not
void function onRequestCapture( event, interceptData, buffer, rc, prc ){
but
void function onRequestCapture( event, data, buffer, rc, prc ){