Small update, we went back as far as HAProxy v2.4.22 and the issue still persists. If we swap out HAProxy for Nginx reverse proxy, it also works fine.
- net::ERR_INCOMPLETE_CHUNKED_ENCODING / malformed HTTP packet... Mike Benoit
- Re: net::ERR_INCOMPLETE_CHUNKED_ENCODING / malformed HT... Willy Tarreau
- Re: net::ERR_INCOMPLETE_CHUNKED_ENCODING / malforme... Willy Tarreau
- Re: net::ERR_INCOMPLETE_CHUNKED_ENCODING / malforme... Mike Benoit
- Re: net::ERR_INCOMPLETE_CHUNKED_ENCODING / malf... Willy Tarreau
- Re: net::ERR_INCOMPLETE_CHUNKED_ENCODING / ... Mike Benoit

