diff --git a/packages/caching-compiler/caching-compiler.js b/packages/caching-compiler/caching-compiler.js
index f8198b360c..308a7a83c8 100644
--- a/packages/caching-compiler/caching-compiler.js
+++ b/packages/caching-compiler/caching-compiler.js
@@ -316,8 +316,7 @@ CachingCompiler = class CachingCompiler extends CachingCompilerBase {
       };
 
       if (this.compileOneFileLater &&
-          inputFile.supportsLazyCompilation &&
-          ! this._cacheDebugEnabled) {
+          inputFile.supportsLazyCompilation) {
         await this.compileOneFileLater(inputFile, getResult);
       } else {
         const result = await getResult();
diff --git a/packages/caching-compiler/multi-file-caching-compiler.js b/packages/caching-compiler/multi-file-caching-compiler.js
index 91b03ca386..4b4ceaf72e 100644
--- a/packages/caching-compiler/multi-file-caching-compiler.js
+++ b/packages/caching-compiler/multi-file-caching-compiler.js
@@ -148,8 +148,7 @@ extends CachingCompilerBase {
       };
 
       if (this.compileOneFileLater &&
-          inputFile.supportsLazyCompilation &&
-          ! this._cacheDebugEnabled) {
+          inputFile.supportsLazyCompilation) {
         if (! this.isRoot(inputFile)) {
           // If this inputFile is definitely not a root, then it must be
           // lazy, and this is our last chance to mark it as such, so that
diff --git a/tools/isobuild/compiler-plugin.js b/tools/isobuild/compiler-plugin.js
index 8f1ada97a8..aeaff516fa 100644
--- a/tools/isobuild/compiler-plugin.js
+++ b/tools/isobuild/compiler-plugin.js
@@ -722,7 +722,7 @@ class ResourceSlot {
     });
 
     if (this.packageSourceBatch.useMeteorInstall &&
-        options.lazy) {
+        cssResource.lazy) {
       // If the current packageSourceBatch supports modules, and this CSS
       // file is lazy, add it as a lazy JS module instead of adding it
       // unconditionally as a CSS resource, so that it can be imported
@@ -778,12 +778,15 @@ class ResourceSlot {
         // stub, so setting .implicit marks the resource as disposable.
       }).implicit = true;
 
-      // If there was an error processing this file, cssResource.data will
-      // not be a Buffer, and accessing cssResource.data here should cause
-      // the error to be reported via inputFile.error.
-      if (Buffer.isBuffer(cssResource.data)) {
-        this.outputResources.push(cssResource);
+      if (! cssResource.lazy &&
+          ! Buffer.isBuffer(cssResource.data)) {
+        // If there was an error processing this file, cssResource.data
+        // will not be a Buffer, and accessing cssResource.data here
+        // should cause the error to be reported via inputFile.error.
+        return;
       }
+
+      this.outputResources.push(cssResource);
     }
   }