Dear Igor,
I may have a clue for you.
I downloaded files you posted on this forum on 31/12/2019. (Wedding album)
handbrake-4k-60p.mp4 and pte-4k-60p-hevc.mp4 play ok.
pte.4k-60pnvenc.mp4 and pte10-4k-60p,mp4 do not play.
I must confess I do not understand the differences between the encoding systems or how to encode using the successful formats.
Regards.
Peter.