Occasionally log fields pqsi and pqsp become 0 for cache miss requests

According to the document at [this link](https://docs.trafficserver.apache.org/en/latest/admin-guide/logging/formatting.en.html#network-addresses-ports-and-interfaces), it states that "Cache hits will yield a value of 0".

However, during my experiments with using Traffic Server as a reverse proxy, I have noticed that Traffic Server occasionally sets the values of log fields pqsi and pqsp to 0 for cache miss requests.

I have provided a reproduction of this issue on GitHub:
https://github.com/hnakamur/ats-nginx-bad-request/tree/ats_log_pqsi_and_pqsp_zero

Additionally, log files and tcpdump outputs have been included within the repository for further analysis.

Your assistance in investigating this matter would be greatly appreciated.

Thank you.