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Hello,
I had to fix a similar issue yesterday. The problem was that the Vhost for domainB.com for port 80 was missing.
However in your case the config indeed looks correct. As long as you have a Vhost for domainB.com for port 80 it should work fine.
Can you confirm if you have restarted apache after those changes?
Also can you check if you have a Varnish running on port 80 or similar service? If so try restarting that as well
Hope that this helps! Regards, Bobby
I have the same issue with my lamp stack. Appreciate you posting your issue (and your positive results).
Thanks!