Question HDRP 2019.2.14f1 - Strange flickering / shadow issue at certain angles.

We're having a strange issue with HDRP in 2019.2.1, has anyone seen something like this before?
Our first assumption was something with shadow cascades but changing every setting doesn't fix this issue or change it in any way.
I've looked through a bunch of similar posts, all slightly different but not quite the same issue as ours, and I've tried adjusting every setting within hdrp I can think of.
We aren't doing any super fancy post-effects so I can't think what else could be causing this.
Can anyone suggest anything?

We're going to duplicate the project and try migrating to 2019.3 now to see if that fixes anything.
Thanks for any help / suggestions.

[EDIT]
Migrating to unity version 2019.3.2f1 seems to have solved the flashing shadows issue.