I have this problem with the parallax in the nether when combining Seus V11 with the Vanilla Normals Renewed, it only happens to me with this texture pack and this shader I have everything well configured in the Seus. I am using version 1.14.3.
I don't know why it happens :(
Sorry my english xD

As an example:
With the Robobo1221 shaders the resource pack works well and the Seus v11 works well with other resource packs with parallax.
It is confusing xD

Indeed, that's strange… Did you set up the texture resolution to x16 ?

Sooo, in the absence of response, I'll suppose it's not the case an this is not an issue related to the resource pack, so, issue close !

@Poudingue I'm not the author of issue, but... Yes, this kind of artifacts are caused by texture resolution mismatch. As soon as I set up texture resolution to 16, it's gone, thank you :)