Objects with displacement disappear at high resolutions

[dj_buckley]

I've got an image I'm trying to render.  In IR everything works fine.

If I do a production render at the main walls disappear if i go above 6k pixels on the longest edge.  6k is fine, 7k walls disappear

This only happens when displacement is enabled on the walls.

The displacement map is 11k.  But I've also tested with a smaller one and the same happens.

8k and 11k is probably overkill I know, but it still doesn't explain why it's disappearing in the main render but not IR.  Is there some threshold i'm unaware of somewhere?

I have 196GB of RAM and i'm not going anywhere near using it all so it can't be a ram issue.

[dj_buckley]

It looks like the issue was the displacement screen size being set to 0.5px, changing that to 1px and the wall returns in the render at 8k.

[Tom]

Interesting. Glad to know you fixed your issue.
I usually set the screen size to 1.5 pixel but very rarely less than that as it produces excessive RAM usage and doesn't improve that much the appearance of the displacement.