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Example project to reproduce aforementioned problem is in attachments base.zip.

Compilation of project generated by CMake 3.16.0-rc2 fails with the following notification (comparing to 3.15.0-rc1):

AutoMoc error
-------------
"SRC:/qtgroupboxpropertybrowser.cpp"
includes the moc file "moc_qtgroupboxpropertybrowser.cpp",
but a header "qtgroupboxpropertybrowser.{h,hh,h++,hm,hpp,hxx,in,txx}"
could not be found in the following directories
  "SRC:"
  "BIN:"
  "SRC:"

Interesting observation: if all files without extension (like QtProperty) are deleted from source directory, project will be compiled without any error.

Thank you in advance.