BUG #16353: pg_isready timeout is ignored

The following bug has been logged on the website:

Bug reference:      16353
Logged by:          vonProteus
Email address:      vonproteus+postgresql.org@gmail.com
PostgreSQL version: 11.7
Operating system:   docker postgres:11-alpine (x64)
Description:

hi
i have problem with pg_isready and time out 
it look like it is ignored
this is my setup

$ docker run --name some-postgres -e POSTGRES_PASSWORD=mysecretpassword -p
3333:5432 --rm -d postgres:11-alpine
4765f8dc49374044d551b3cdb0ce5284905ee1c01bf6a81b2cddf30ab6798bc8

$ time docker run --rm  postgres:11-alpine pg_isready -t 120 -h
10.110.12.163 -p 3333
10.110.12.163:3333 - accepting connections

real    0m0.781s
user    0m0.000s
sys     0m0.031s

$ docker stop some-postgres
some-postgres

$ time docker run --rm  postgres:11-alpine pg_isready -t 120 -h
10.110.12.163 -p 3333
10.110.12.163:3333 - no response

real    0m2.722s
user    0m0.000s
sys     0m0.031s

i would expect that second call would exit after 120s
i run this on windows