I've pushed the patch in #973052 to a new branch named bug-973052 in the https://salsa.debian.org/dns-team/unbound repo (on top of branches/1.9.0-2_deb10).
Hopefully one of the other DNS folks will review it and merge it if it looks reasonable. Not sure whether we should release a new version with just this fix, but it might be worth proposing it. --dkg
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