There is no dns related change between 57fda8c8 and 1c8e093.
Only the kernel was rollback to 4.14.171 because the logging bug.
In next i have updated to 4.14.173 which is also not affected by the logging bug but it solves a reconnect bug with PPPoE.
DNS is still unchanged to 57fda8c8
Have you tried to reload the page. Sometimes unbound need some time to startup after changing servers. Also check the unbound system log.