Vulkan: Edge Z-fighting

[videoP]

I have a very large terrain map structured as an ocean floor (currently still ground texture) with islands coming out of it. The ocean floor is z-fighting with the edges of the islands only on Vulkan renderer. It also happens on Tayst's PC (only on vulkan) so I think it's not HW related.

Operating system and version:
Windows 10 22H2

Description of the bug (and if possible, steps to reproduce the bug):
Vulkan:

Vanilla:

Map if you want to test yourself:
crossfire.zip
What did you expect to happen instead?
Vanilla behaviour (no z-fighting)