Handling connections missing TCP handshake

I have a pcap with a bunch of HTTP connections. The TCP handshake (SYN, SYN-ACK, ACK) is missing for most of those connections. When processing the PCAP with a default bro config, those HTTP sessions missing the handshake are not logged in http.log (I can see the GET requests and HTTP responses in the PCAP). Is there an easy way to get Bro’s HTTP analyzer to process them anyway?