Running dnspeep on a Fedora 33 machine with both IPv4 and IPv6 connectivity I can sometimes see queries but then sooner or later I get:

thread 'main' panicked at 'index out of bounds: the len is 0 but the index is 0', src/main.rs:153:21
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

The backtrace doesn't seem to be very useful; it appears to be failing where it says it's failing, in the line:

    let question = &dns_packet.questions[0];

This seems to be the result of the authoritative DNS server I'm running on this machine answering a query by telling the sender to go away (I think):

In  IP [RANDOM-IP].30279 > [MYIP].domain: 5140+ [1au] ANY? . (33)
Out IP [MYIP].domain > [RANDOM-IP].30279: 5140-| [0q] 0/0/1 (23)

Wireshark confirms that the relevant DNS reply packet has no questions, no answer RRs, no authority RRs, and one additional RR of type OPT.

(This has already been useful, I had no idea people were spraying my authoritative nameserver with these queries.)