Hi, I'm the other developer for Ruins of Growsseth. I'm opening an issue since the problem I'm having (while still being related to #32) is about a different problem.

After updating the Lithostitched version in the libs.versions.toml file from the 1.3.0 version of the initial compatibility patch to 1.4.2, the neoforge - Client fails to run at the compileKotlin task, same for the Gradle build. Downgrading the version to 1.4.1 fixes the issue.

This is the error I get:

e: file:///C:/Users/user/ruins-of-growsseth/base/src/main/kotlin/com/ruslan/growsseth/compat/LithoStitchedCompat.kt:17:27 Cannot access class 'net.minecraft.class_3195'. Check your module classpath for missing or conflicting dependencies.
e: file:///C:/Users/user/ruins-of-growsseth/base/src/main/kotlin/com/ruslan/growsseth/compat/LithoStitchedCompat.kt:17:27 Cannot access 'net.minecraft.class_3195' which is a supertype of 'dev.worldgen.lithostitched.worldgen.structure.DelegatingStructure'. Check your module classpath for missing or conflicting dependencies.
e: file:///C:/Users/user/ruins-of-growsseth/base/src/main/kotlin/com/ruslan/growsseth/compat/LithoStitchedCompat.kt:17:38 Unresolved reference 'type'.

The same issue always happens on Fabric, but downgrading to versions 1.4.1 or 1.3.0 gives a different error:

e: file:///C:/Users/user/ruins-of-growsseth/base/src/main/kotlin/com/ruslan/growsseth/compat/LithoStitchedCompat.kt:3:8 Unresolved reference 'dev'.
e: file:///C:/Users/user/ruins-of-growsseth/base/src/main/kotlin/com/ruslan/growsseth/compat/LithoStitchedCompat.kt:16:23 Unresolved reference 'DelegatingStructure'.
e: file:///C:/Users/user/ruins-of-growsseth/base/src/main/kotlin/com/ruslan/growsseth/compat/LithoStitchedCompat.kt:17:27 Unresolved reference 'delegate'.

This is the commit with the version change and added Fabric compatibility (that doesn't work), in case it's needed.

Also, I don't know if this helps, but this is how the DelegatingStructure class looks like in version 1.4.1 when inspected from Intellij Idea:

public class DelegatingStructure extends Structure {
    public static final MapCodec<DelegatingStructure> CODEC;
    public static final StructureType<DelegatingStructure> TYPE;
    private final DelegatingConfig config;

And this is what it looks like in 1.4.2:

public class DelegatingStructure extends class_3195 {
    public static final Codec<DelegatingStructure> CODEC;
    public static final class_7151<DelegatingStructure> TYPE;
    private final DelegatingConfig config;

The version numbers for all versions across modloaders and game versions are the same, you have to use the version id.

When I release 1.4.4 I'll move to a better format (likely something like 1.4.4-neoforge-1.21)

I can confirm that using maven.modrinth:lithostitched:1.4.2 leads to

Cannot access class 'net.minecraft.class_3195'. Check your module classpath for missing or conflicting dependencies.

The error is reported for this line in LithoStitchedCompat.kt:

    fun isValidJigsawCheckStructure(struct: Structure): Boolean {
        if (struct is DelegatingStructure) {
            // Error reported for delegate()
            return struct.delegate().type() == StructureType.JIGSAW
        }
        return false
    }

I changed the lithostitched version to Q8TwwzCq for common and Neo and 73Oigiov for Fabric (1.4.2 for both, ids taken from Modrinth as asked).
It fixed the build issue with Neo, but not with Fabric. I tested using the Fabric version for common but it doesn't work, and it makes Neo also crash. The error message is the same of the previous comment.

This is the commit with the changes. Are we setting something wrong?

Try using modImplementation instead of compileOnly, seems to work when I try.

That seems to have done the trick, thanks!