`dig -4` just hangs if ::1 is default resolver

Summary

dig -4 just hangs if ::1 is default resolver

• Bad: DiG 9.12.2 & 9.13.2 – hangs indefinitely.
• Reasonable: DiG 9.10.3-P4 – it asks 127.0.0.1 instead.

Steps to reproduce

• put nameserver ::1 (only) into /etc/resolv.conf.
• run dig -4 isc.org

What is the expected correct behavior?

Behavior of 9.10 sounds okay to me. Failing with some understandable error is another option I see.