$ grep CAA /var/db/knot/nasqueron.org.zone nasqueron.org. 300 IN CAA 0 issue letsencrypt.org nasqueron.org. 172800 IN CAA 0 issuewild letsencrypt.org
Recommandation from https://www.digicert.com/faq/dns/what-is-ttl is 1800-3600.
The 1800 could be coherent with the 300 former choice for Let's Encrypt.