i think i fixed it?

api/geyser/build.gradle.kts

@@ -1,3 +1,7 @@
+plugins {
+    id("geyser.api-conventions")
+}
+
 dependencies {
     api(projects.api)
 }

build-logic/src/main/kotlin/geyser.base-conventions.gradle.kts

@@ -30,12 +30,4 @@ java {
     targetCompatibility = JavaVersion.VERSION_16
 
     withSourcesJar()
-}
-
-publishing {
-    publications.create<MavenPublication>("mavenJava") {
-        groupId = project.group as String
-        artifactId = project.name
-        version = project.version as String
-    }
 }

build.gradle.kts

@@ -1,5 +1,3 @@
-import org.gradle.accessors.dm.ApProjectDependency
-
 plugins {
     `java-library`
     id("geyser.build-logic")

core/build.gradle.kts

@@ -4,7 +4,7 @@ import net.kyori.blossom.BlossomExtension
 plugins {
     id("net.kyori.blossom")
     id("net.kyori.indra.git")
-    id("geyser.shadow-conventions")
+    id("geyser.publish-conventions")
 }
 
 dependencies {