What firewall are you using? Docker doesn't like non-iptables firewalls and it has been more than once that I changed my nftables config and really the whole networking stack to figure that out. I have a ubuntu server vm which had some iptables save-restore unit activated which was messing with my rules, that was fun to debug.
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Better check, you definitely already have a firewall running since docker needs it for NAT. A fresh debian has, as far as I know nftables and iptables-nft installed.