I have no issues using HEVC or exporting HEVC files. Do you have the HEVC extension from M$ installed and does your hardware support it?
Now while it might be a "newer" codec, it isn't a "standard" one.
From the website:
HEVC** (H.265), XAVC, MXF, DVCPRO HD, XAVC S, GoPro LRV, Cineform
** HEVC (H.265) support requires supporting PC hardware or graphics card and Microsoft HEVC video extension installed.