[auser1989]

each build played the HEVC files created before 2nd May correctly
each build crashed while trying to play HEVC files created after 2nd/3rd May - these are sourced from the same source as the problem file, so it could be something specific in the way that they are generated.

Are you in contact with the source - are you able to ask them what changed from 2nd May onwards?

I'm not in contact with the source, the files are usenet downloads, mainly from one posting group.  Looking at the files, before and after the 2nd/3rd May, the main difference appears to be that the earleir files had an audio stream encoded using codec MPEG AAC Audio (mp4a), whilst the more recent, problem files, used A/52 B Audio (aka E-AC3) (eac3) - according to VLC's codec info panel.
So, I think that the 2nd/3rd May date is when the posting group switched to producing 720p & 1080p HEVC with AC3 5.1 sound.

I tried playing some files from before 2nd May (from Feb 2019) that were encoded similarly to the recent problem file(s), from different sources, and they, too, failed to play in the same way, crashing Kodi. 
To my inexperienced eye, it seems that the problem is closely related to the handling of AC3/E-AC3 audio in HEVC encoded files.

from post 2nd May problem file:
Codec: A/52 B Audio (aka E-AC3) (eac3)
Language: English
Type: Audio
Channels: 3F2M/LFE
Sample rate: 48000 Hz
Bits per sample: 32

from Feb 2019 problem file :
Codec: A52 Audio (aka AC3) (a52 )
Type: Audio
Channels: 3F2M/LFE
Sample rate: 48000 Hz
Bits per sample: 32

AAC 5.1 and DTS 5.1 both play OK, from pre-2nd May files :
Codec: MPEG AAC Audio (mp4a)
Channels: 3F2R/LFE
AAC extension: SBR

Codec: DTS Audio (dts )
Channels: 3F2M/LFE

Unfortunately, I don't know enough about encoding/audio/mkv internals to investigate further without doing some serious research.