I have PE 4.1.3 and Premiere 2017 v 11.1.0 on a Mac.
When I run Plural Eyes, as a plugin, from inside Premiere interface, it generates, as desired, a new sequence with the same name but with the word "synced" added in the end. So far so good. BUT it also generates new clips in my project window. So after each PluralEyes session, I end up having a double setup of clips. No new media is created though.
The weird thing is that next to me there´s another editing bay with the exact same versions of softwares, and it does NOT GENERATE clips. So my guess is that I have some setting in my Premiere to deal with.