TCP reassembly does not appear to be working properly

Hello, everyone.
I am a beginner and I am currently working on an experiment to detect
exploit packets collected in an experimental environment using Snort.

I am currently facing a problem in that I cannot detect HTTP requests
correctly when they are sent in multiple TCP segments. I believe that such
requests should be reassembled by Snort before being detected, but the
output from the show_rebuilt_packets option doesn't seem to indicate that.
How can I make it reassemble correctly? Since Wireshark and Zeek correctly
reassembled the segments, I believe that there is no problem with the
packets. I'm sorry, but I couldn't share the pcap file itself because it
was caught by Gmail's virus detection.

Here is debug output by show_rebuilt_packets.

> ## This is  first segment
> 12/27-00:37:24.591336 TCP 192.168.32.18:44875 -> 192.168.32.116:80
> <http://192.168.32.116/>http_inspect.stream_tcp[8243]:
> - - - - - - - - - - - -  - - - - - - - - - - - -  - - - - - - - - -
> 47 45 54 20 2F 57 65 62 49 44 2F 49 49 53 57 65  GET /Web ID/IISWe
> 62 41 67 65 6E 74 49 46  2E 64 6C 6C 3F 52 65 64  bAgentIF .dll?Red
> ----------------------------------- very large data
> ----------------------------------------
> 6B 50 62 74 48 61 6A 62  59 77 20 48 54 54 50 2F  kPbtHajb Yw HTTP/
> 31 2E 31
>   1.1
> - - - - - - - - - - - -  - - - - - - - - - - - -  - - - - - - - - -
>
> ## I want this segment reassembled with the first segment
> 12/27-00:37:24.591361 TCP 192.168.32.18:44875 -> 192.168.32.116:80
> <http://192.168.32.116/>http_inspect.stream_tcp[83]:
> - - - - - - - - - - - -  - - - - - - - - - - - -  - - - - - - - - -
> 48 6F 73 74 3A 20 76 69  63 74 69 6D 2D 39 2D 35  Host: vi ctim-9-5
> 2D 39 35 0D 0A 55 73 65  72 2D 41 67 65 6E 74 3A  -95..Use r-Agent:
> 20 4D 6F 7A 69 6C 6C 61  2F 34 2E 30 20 28 63 6F   Mozilla /4.0 (co
> 6D 70 61 74 69 62 6C 65  3B 20 4D 53 49 45 20 36  mpatible ; MSIE 6
> 2E 30 3B 20 57 69 6E 64  6F 77 73 20 4E 54 20 35  .0; Wind ows NT 5
> 2E 31 29
>    .1)


Here is the command I used.

> snort -R <rule file> -r <pcap file> -c <config file> -k none --snaplen
> 65535 -z 8


The attached screenshot is the reassembled HTTP request by Wireshark.
Thank you!