diff --git a/src/libANGLE/renderer/gl/BlitGL.cpp b/src/libANGLE/renderer/gl/BlitGL.cpp
index 4901801bb7..9cad3a9df0 100644
--- a/src/libANGLE/renderer/gl/BlitGL.cpp
+++ b/src/libANGLE/renderer/gl/BlitGL.cpp
@@ -1061,6 +1061,14 @@ angle::Result BlitGL::clearRenderbuffer(const gl::Context *context,
                                         RenderbufferGL *source,
                                         GLenum sizedInternalFormat)
 {
+    {
+        const gl::InternalFormat &ifi = gl::GetSizedInternalFormatInfo(sizedInternalFormat);
+        fprintf(stderr,
+                "[POC-TRACE] BlitGL::clearRenderbuffer rb=%u sizedFmt=0x%x componentType=0x%x "
+                "isInt=%d -> issuing plain glClear\n",
+                source->getRenderbufferID(), sizedInternalFormat, ifi.componentType,
+                (ifi.componentType == GL_INT || ifi.componentType == GL_UNSIGNED_INT) ? 1 : 0);
+    }
     ANGLE_TRY(initializeResources(context));
 
     ClearBindTargetVector bindTargets;
diff --git a/src/libANGLE/renderer/gl/FramebufferGL.cpp b/src/libANGLE/renderer/gl/FramebufferGL.cpp
index 9c2a347b1d..726c4ab585 100644
--- a/src/libANGLE/renderer/gl/FramebufferGL.cpp
+++ b/src/libANGLE/renderer/gl/FramebufferGL.cpp
@@ -1337,6 +1337,11 @@ angle::Result FramebufferGL::ensureAttachmentsInitialized(
 {
     if (colorAttachments != getState().getEnabledDrawBuffers())
     {
+        fprintf(stderr,
+                "[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x%x "
+                "enabledDrawBuffers=0x%x -> FALLBACK to per-attachment init\n",
+                (unsigned)colorAttachments.bits(),
+                (unsigned)getState().getEnabledDrawBuffers().bits());
         // Fall back to the default implementation when there are gaps in the enabled draw buffers
         // to avoid modifying the draw buffer state.
         return FramebufferImpl::ensureAttachmentsInitialized(context, colorAttachments, depth,