Hello, I found an old thread with the solution!
In the meshdecals.usf file, located in C:\Program Files\Epic Games\UE_5.0EA\Engine\Shaders\Private,
either comment out (with //) or massively reduce the number in '“Output.Position.z += 0.0001f * Output.Position.w;” (change it from 0.0001f to something like 0.0000001f)
This is supposed to prevent zfighting at a distance, so removing it completely might zfight.