I use cycles and displacement output, with mesh displacement type = “both”.
Sometimes, under hardly determined conditions, blender starts to ignore displacement completely, or to use some improper cached UV map for texture,
untill i create fresh new file and import all the objects and materials in it.
That sucks alot and i start to hate blender.
Do you know how it is possible to turn displacement back?
Maybe some internal caches to clean or whatever?