HTTP collect not working when POST is multiple TCP segments

Thanks for the response. The data I'm collecting is in the first 200 bytes of payload data. I'm only collecting request data from an HTTP POST. The messages are small and rarely get segmented into more than one TCP segment. However, when the data is within two TCP segments (single HTTP message but 2 TCP segments due to small MTU on a device in the path), after executing HTTP::collect in the HTTP_REQUEST event, it collects 0 bytes and therefore the HTTP_REQUEST_DATA event does not seem to be triggering. I've also opened a case with F5 but was hoping someone else may have come across this.