bonita 6.4.1

REST API bug found executing a task /bonita/API/bpm/activity/[activityId]

We are using REST API to complete humanTask and we have found that sometimes we get a Response Status Code 404 Not found but the activity complete without error on bonita engine. This behavior is strange and happens just 3/4 times a day but we have many other activity completed of the same type. No error is logged on the bonita application log only the 404 response on the jboss http log, at the same time we log the 404 error the activity is signed as completed on the bonita engine DB without any error.