Misconfiguration on our part might be even the pi itself and not necessarily unbound as the same happen to me when I tried PowerDNS.
Something with these sites specifically, however I've seen on your thread that others managed to resolve them so I don't know...
Also, on your thread you said you have an Asus router correct? so I assume you have another router which is the ISP one and the Asus one connected to it? I have a similar setup (but with xiaomi router) Maybe its related?
If you connect your PC directly to your ISP's fiber converter (bypass your router and bypass your Pi), then launch CMD and type: nslookup -type=a ns3.bezeqint.net. 212.179.7.7
What do you get?
That's exactly what I'm getting and this is why you have issues with sites when you're using Unbound.
Any site that has in its route Bezeq's name server, will fail when using recursive DNS.
If you switch to 8.8.8.8 (iterative DNS) you won't have issues reaching sites that have Bezeq name servers in their route.
@Yahavsh this issue only happened to me since I moved to a different city (northern part of Israel). I don't know if it's a geographical issue, but you just helped me to verify that there's an issue with using recursive DNS and Bezeq name servers.
pi@ph5b:~ $ sudo unbound-control lookup n12.co.il
The following name servers are used for lookup of n12.co.il.
;rrset 86395 3 0 2 0
n12.co.il. 86395 IN NS ns1.bezeqint.net.
n12.co.il. 86395 IN NS ns2.bezeqint.net.
n12.co.il. 86395 IN NS ns3.bezeqint.net.
;rrset 55 1 0 8 0
ns3.bezeqint.net. 55 IN A 192.115.132.132
;rrset 86395 1 0 1 0
ns3.bezeqint.net. 86395 IN AAAA 2001:4cd0::10:0:0:132
;rrset 55 1 0 8 0
ns2.bezeqint.net. 55 IN A 212.179.7.7
;rrset 86395 1 0 1 0
ns2.bezeqint.net. 86395 IN AAAA 2001:4cd0::11:0:0:7
;rrset 55 1 0 8 0
ns1.bezeqint.net. 55 IN A 62.219.128.128
;rrset 86395 1 0 1 0
ns1.bezeqint.net. 86395 IN AAAA 2001:4cd0::31:0:0:128
Delegation with 3 names, of which 0 can be examined to query further addresses.
It provides 6 IP addresses.
2001:4cd0::31:0:0:128 not in infra cache.
62.219.128.128 not in infra cache.
2001:4cd0::11:0:0:7 not in infra cache.
212.179.7.7 not in infra cache.
2001:4cd0::10:0:0:132 not in infra cache.
192.115.132.132 rto 401 msec, ttl 895, ping 13 var 97 rtt 401, tA 0, tAAAA 0, tother 0, EDNS 0 probed.