I could reproduce the issue by building git v1.8.5 and the issue was
fixed after cherry-picking "iptables-nft: fix basechain policy
configuration"

$ git log
commit 8d985eb4eb7a23fd98b75d71179af40169144cc5 (HEAD -> bug1898547)
Author: Pablo Neira Ayuso <pa...@netfilter.org>
Date:   Fri Oct 2 13:44:36 2020 +0200

    iptables-nft: fix basechain policy configuration
    
    Previous to this patch, the basechain policy could not be properly
    configured if it wasn't explictly set when loading the ruleset, leading
    to iptables-nft-restore (and ip6tables-nft-restore) trying to send an
    invalid ruleset to the kernel.
    
    Signed-off-by: Arturo Borrero Gonzalez <art...@netfilter.org>
    Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>

commit 14ac250946289e280fb09ef978a45042871275b0 (tag: v1.8.5)
Author: Pablo Neira Ayuso <pa...@netfilter.org>
Date:   Wed Jun 3 11:37:52 2020 +0200

    configure: bump version for 1.8.5 release
    
    Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>


** Also affects: iptables (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1898547

Title:
  neutron-linuxbridge-agent fails to start with iptables 1.8.5

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