Among numerous examples of folks running Bind9 in split-view mode
similar to my config, I found this unanswered DNSSEC-related post,

 "DNSSEC Validating Resolver and Views"
  https://lists.isc.org/pipermail/bind-users/2010-March/079166.html

which seems, at least, similar to the issue I'm seeing,

" ... This setup has been working for years but is now broken for
clients
 querying from a guest network (via the guest view) unless the queries
 have checking disabled. ..."

Checking with my server for apparently unsigned 'www.adobe.com',

dig www.adobe.com

        ; <<>> DiG 9.8.0-P1 <<>> www.adobe.com
        ;; global options: +cmd
        ;; Got answer:
        ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 12026
        ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0,
        ADDITIONAL: 0

        ;; QUESTION SECTION:
        ;www.adobe.com.                 IN      A

        ;; Query time: 24 msec
        ;; SERVER: 10.10.10.100#53(10.10.10.100)
        ;; WHEN: Mon May  9 13:53:29 2011
        ;; MSG SIZE  rcvd: 31

dig www.adobe.com +cd

        ; <<>> DiG 9.8.0-P1 <<>> www.adobe.com +cd
        ;; global options: +cmd
        ;; Got answer:
        ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50312
        ;; flags: qr rd ra cd; QUERY: 1, ANSWER: 2, AUTHORITY: 2,
        ADDITIONAL: 0

        ;; QUESTION SECTION:
        ;www.adobe.com.                 IN      A

        ;; ANSWER SECTION:
        www.adobe.com.          3592    IN      CNAME  
        www.wip4.adobe.com.
        www.wip4.adobe.com.     30      IN      A       192.150.16.60

        ;; AUTHORITY SECTION:
        wip4.adobe.com.         3337    IN      NS     
        da1gtm001.adobe.com.
        wip4.adobe.com.         3337    IN      NS     
        3dns-5.adobe.com.

        ;; Query time: 52 msec
        ;; SERVER: 10.10.10.100#53(10.10.10.100)
        ;; WHEN: Mon May  9 13:53:37 2011
        ;; MSG SIZE  rcvd: 115

shows, as in the referenced post, that checking an dnssec-unsigned
domain @ resolver with dnssec-validation enabled returns DATA only if
that validation is DISABLED.

DCh
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