I am observing a rather funky highlighting effect with dnstap-output:

Without dnstap { all; };:

And here is dnstap { all; }; without dnstap-output (looks as expected):

Here is the sample configuration file for easy copy-paste:
options {
dnstap-output file "dnstap.out";
dnstap { all; };
send-cookie no;
require-server-cookie no;
minimal-responses no;
dnssec-validation yes;
qname-minimization disabled;
};
I would be happy to help with debugging this and/or test any potential fixes.