diff --git a/swh/lister/nixguix/lister.py b/swh/lister/nixguix/lister.py
--- a/swh/lister/nixguix/lister.py
+++ b/swh/lister/nixguix/lister.py
@@ -430,6 +430,18 @@
                 #       the output can be anything, including a directory tree.
                 outputHashMode = artifact.get("outputHashMode", "flat")
 
+                if not is_tar and outputHashMode == "recursive":
+                    # T4608: Cannot deal with those properly yet as some can be missing
+                    # 'critical' information about how to recompute the hash (e.g. fs
+                    # layout, executable bit, ...)
+                    logger.warning(
+                        "Skipping artifact <%s>: 'file' artifact of type <%s> is "
+                        " missing information to properly check its integrity",
+                        artifact,
+                        artifact_type,
+                    )
+                    continue
+
                 logger.debug("%s: %s", "dir" if is_tar else "cnt", origin)
                 yield ArtifactType.ARTIFACT, Artifact(
                     origin=origin,
diff --git a/swh/lister/nixguix/tests/data/sources-failure.json b/swh/lister/nixguix/tests/data/sources-failure.json
--- a/swh/lister/nixguix/tests/data/sources-failure.json
+++ b/swh/lister/nixguix/tests/data/sources-failure.json
@@ -37,6 +37,17 @@
       ],
       "inferredFetcher": "fetchzip"
     },
+    {
+      "outputHash": "0s2mvy1nr2v1x0rr1fxlsv8ly1vyf9978rb4hwry5vnr678ls522",
+      "outputHashAlgo": "sha256",
+      "outputHashMode": "recursive",
+      "type": "url",
+      "urls": [
+        "https://www.unicode.org/Public/emoji/12.1/emoji-zwj-sequences.txt"
+      ],
+      "integrity": "sha256-QhRN0THZ7uIzh2RldFJyfgdP0da0u5Az6GGLbIPfVWg=",
+      "inferredFetcher": "unclassified"
+    },
     {
       "type": "url",
       "urls": [ "unknown://example.org/wrong-scheme-so-skipped.txt" ],