font issues in Impress while presenting

I recently upgraded to LibreOffice 6 and notice that lines (or parts of lines) go missing often while presenting slides in LibreOffice Impress.

I am running Windows 10 64 bit. My LO settings have OpenGL disabled and Open CL disabled:

I get the same results if I enable OpenGL and/or OpenCL

No animations are used … just a line of text showing up on click.

Any ideas? I am attaching my file as well:file to test.odp

I went back to LO 5.4 (from LO 6.0) to eliminate this issue.