diff --git a/frontends/web/stego_worker.py b/frontends/web/stego_worker.py
index ad7aacb..ced9850 100644
--- a/frontends/web/stego_worker.py
+++ b/frontends/web/stego_worker.py
@@ -171,8 +171,7 @@ def decode_operation(params: dict) -> dict:
     # Resolve channel key (v4.0.0)
     resolved_channel_key = _resolve_channel_key(params.get("channel_key", "auto"))
 
-    _write_decode_progress(progress_file, 25, "extracting")
-
+    # Library handles progress internally via progress_file parameter
     # Call decode with correct parameter names
     result = decode(
         stego_image=stego_data,
@@ -183,9 +182,9 @@ def decode_operation(params: dict) -> dict:
         rsa_password=params.get("rsa_password"),
         embed_mode=params.get("embed_mode", "auto"),
         channel_key=resolved_channel_key,  # v4.0.0
+        progress_file=progress_file,  # v4.2.0: pass through for real-time progress
     )
-
-    _write_decode_progress(progress_file, 90, "finalizing")
+    # Library writes 100% "complete" - no need for worker to write again
 
     if result.is_file:
         return {
diff --git a/test_data/phonebooth.pem b/test_data/phonebooth.pem
new file mode 100644
index 0000000..cf8a94e
--- /dev/null
+++ b/test_data/phonebooth.pem
@@ -0,0 +1,30 @@
+-----BEGIN ENCRYPTED PRIVATE KEY-----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+-----END ENCRYPTED PRIVATE KEY-----