And I can also confirm that the workaround in comment #2 (namely VBoxManage modifyvm "VM name" --natdnshostresolver1 on) works perfectly well therefore it looks like that option should be enabled by default.
And I can also confirm that the workaround in comment #2 (namely VBoxManage modifyvm "VM name" --natdnshostres olver1 on) works perfectly well therefore it looks like that option should be enabled by default.