Presenter view doesn't start on host computer, where we start presentation. Tested in Linux and repro from LO 6.4+, LO 6.3 was OK. Presentation is shown on external display, as normal.
What's the date of the build you use?
Indeed, I think it's been fixed about 1 week ago.
*** This bug has been marked as a duplicate of bug 128166 ***
It was http://libreoffice.soluzioniopen.com/pre-releases/6.4/LibreOffice-184.108.40.206.alpha1-x86_64.AppImage.
You are right, master from today works.