doth system test fails due to SSL error in BIO: 5 unexpected error

For example here:

https://gitlab.isc.org/isc-projects/bind9/-/jobs/1614684

I:doth:checking DoH query (POST) (6)
02-Apr-2021 12:17:13.870 SSL error in BIO: 5 unexpected error
02-Apr-2021 12:17:13.870 SSL error in BIO: 5 unexpected error
02-Apr-2021 12:17:13.870 SSL error in BIO: 5 unexpected error
I:doth:failed

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