diff --git a/src/main/java/net/fabricmc/loom/configuration/mods/ModConfigurationRemapper.java b/src/main/java/net/fabricmc/loom/configuration/mods/ModConfigurationRemapper.java
index e646405d..0079e333 100644
--- a/src/main/java/net/fabricmc/loom/configuration/mods/ModConfigurationRemapper.java
+++ b/src/main/java/net/fabricmc/loom/configuration/mods/ModConfigurationRemapper.java
@@ -94,7 +94,7 @@ public class ModConfigurationRemapper {
 
 				final Configuration target = RemapConfigurations.getOrCreateCollectorConfiguration(project, entry, runtime);
 				// We copy the source with the desired usage type to get only the runtime or api jars, not both.
-				final Configuration sourceCopy = entry.getSourceConfiguration().get().copy();
+				final Configuration sourceCopy = entry.getSourceConfiguration().get().copyRecursive();
 				final Usage usage = project.getObjects().named(Usage.class, runtime ? Usage.JAVA_RUNTIME : Usage.JAVA_API);
 				sourceCopy.attributes(attributes -> attributes.attribute(Usage.USAGE_ATTRIBUTE, usage));
 				configsToRemap.put(sourceCopy, target);
diff --git a/src/main/java/net/fabricmc/loom/configuration/processors/SpecContextImpl.java b/src/main/java/net/fabricmc/loom/configuration/processors/SpecContextImpl.java
index 83de5673..9ce71a41 100644
--- a/src/main/java/net/fabricmc/loom/configuration/processors/SpecContextImpl.java
+++ b/src/main/java/net/fabricmc/loom/configuration/processors/SpecContextImpl.java
@@ -128,7 +128,7 @@ public record SpecContextImpl(List<FabricModJson> modDependencies, List<FabricMo
 		final Usage usage = project.getObjects().named(Usage.class, runtime ? Usage.JAVA_RUNTIME : Usage.JAVA_API);
 
 		return settings -> {
-			final Configuration configuration = settings.getSourceConfiguration().get().copy();
+			final Configuration configuration = settings.getSourceConfiguration().get().copyRecursive();
 			configuration.attributes(attributes -> attributes.attribute(Usage.USAGE_ATTRIBUTE, usage));
 			return configuration.resolve().stream().map(File::toPath);
 		};
diff --git a/src/test/resources/projects/maven/build.gradle b/src/test/resources/projects/maven/build.gradle
index 0b19a3ad..2c3e3786 100644
--- a/src/test/resources/projects/maven/build.gradle
+++ b/src/test/resources/projects/maven/build.gradle
@@ -16,12 +16,17 @@ repositories {
 	}
 }
 
+configurations {
+	testConfig
+	modImplementation.extendsFrom testConfig
+}
+
 dependencies {
 	minecraft "com.mojang:minecraft:1.16.5"
 	mappings "net.fabricmc:yarn:1.16.5+build.5:v2"
 	modImplementation "net.fabricmc:fabric-loader:0.11.2"
 
-	modImplementation System.getProperty("loom.test.resolve")
+	testConfig System.getProperty("loom.test.resolve")
 }
 
 task checkClasspaths {