We are using AEM 6.3 Sp2 and did not face this issue. I guess the bug is corrected in some release. However, when I deactivate the page imported through design importer the page itself is removed from publish but the clientlibs were not removed.

I have faced the same thing that ahmedmusallam​ has faced. It ll be great if documented. Ignore this comment if already done.kautuksahni​

Hi Opkar, I am getting the similar error. Error:          java.lang.Error: Unresolved compilation problems: Only a type can be imported. com.adobe.cq.contentinsight.ProviderSettingsManager resolves to a package I observe that the ProvideSettingsManager is an adobe provided class and I don't know why...