after the HAProxy upgrade from 2.4.15 to 2.4.16 we observe in logs that
very small percent of sessions are terminated with IH-- status.

Docs say that "I" should never happen and should be reported. All the
terminated sessions used one of the POST/PATCH/PUT methods and all of them
were on HTTP/2.0.

I'm not able to replicate it manually, but maybe you will know which patch
might have caused it.

haproxy -v
HAProxy version 2.4.16-9d532c4 2022/04/29 - https://haproxy.org/
Status: long-term supported branch - will stop receiving fixes around Q2
Known bugs: http://www.haproxy.org/bugs/bugs-2.4.16.html
Running on: Linux 4.15.0-173-generic #182-Ubuntu SMP Fri Mar 18 15:53:46
UTC 2022 x86_64

Kind regards,

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