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Debian: no traceroute output for single host

br flag

After a recent upgrade to Debian 11 on my router I noticed that my desktop (current W10) only sporadically gets replies when doing a traceroute across the router, usually just * * *, rarely a single reply. Several other systems (Linux/Windows) work fine, so does everything else. Using tcpdump on the router I see the incoming ICMP messages but no replies from the router. Comparing a dump from my desktop with a working system in Wireshark, I see nothing extraordinary.
I'm stumped, does anybody have any ideas?

mangohost

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