dig YAML output does not quote strings containing ": "

Summary

I'm using the +yaml option for dig for machine-parseable output and encountered a host emitting TXT records that contain ": ". These records are not quoted for some reason. When parsing the YAML output with libyaml, it misinterprets such records as a mapping instead of a string.

BIND version affected

DiG 9.19.25-dev
BIND 9.19.25-dev (Development Release) <id:392e719>

Steps to reproduce

1. dig @8.8.8.8 +yaml vlsu.ru TXT
2. Alternatively, ruby -e 'require "yaml";puts YAML.safe_load(`dig @8.8.8.8 +yaml vlsu.ru TXT`, permitted_classes: [Time])[0]["message"]["response_message_data"]["ANSWER_SECTION"]'

What is the current bug behavior?

Output of the 1st command:

[...]
      ANSWER_SECTION:
        - vlsu.ru. 3427 IN TXT "yandex-verification: f248f83d5303e97d"
        - vlsu.ru. 3427 IN TXT "v=spf1 mx -all"
        - vlsu.ru. 3427 IN TXT "google-site-verification=3LAzNkhE9EXeAevwahpx_ZhTIbKtkKBb5mXR5nxlP30"

Output of the 2nd command:

vlsu.ru. 3523 IN TXT "v=spf1 mx -all"
vlsu.ru. 3523 IN TXT "google-site-verification=3LAzNkhE9EXeAevwahpx_ZhTIbKtkKBb5mXR5
nxlP30"                                   
{"vlsu.ru. 3523 IN TXT \"yandex-verification"=>"f248f83d5303e97d\""}

What is the expected correct behavior?

Output of the 1st command:

[...]
      ANSWER_SECTION:
        - 'vlsu.ru. 3427 IN TXT "yandex-verification: f248f83d5303e97d"'
        - vlsu.ru. 3427 IN TXT "v=spf1 mx -all"
        - vlsu.ru. 3427 IN TXT "google-site-verification=3LAzNkhE9EXeAevwahpx_ZhTIbKtkKBb5mXR5nxlP30"

Output of the 2nd command:

vlsu.ru. 3523 IN TXT "v=spf1 mx -all"
vlsu.ru. 3523 IN TXT "google-site-verification=3LAzNkhE9EXeAevwahpx_ZhTIbKtkKBb5mXR5
nxlP30"                                   
vlsu.ru. 3523 IN TXT "yandex-verification: f248f83d5303e97d"

Relevant configuration files

None

Relevant logs

None