Be sure to invalidate cache for both branched of pipe_file

s3fs/core.py

@@ -1141,7 +1141,7 @@ async def _pipe_file(
         size = len(data)
         # 5 GB is the limit for an S3 PUT
         if size < min(5 * 2**30, 2 * chunksize):
-            return await self._call_s3(
+            await self._call_s3(
                 "put_object", Bucket=bucket, Key=key, Body=data, **kwargs
             )
         else:

s3fs/tests/test_s3fs.py

@@ -2802,3 +2802,13 @@ def test_upload_part_with_prime_pads(s3_fixed_upload_size):
 
     with s3_fixed_upload_size.open(a, "r") as f:
         assert len(f.read()) == 2 * block + pad1 + pad2
+
+
+@pytest.mark.asyncio
+async def test_invalidate_cache(s3: s3fs.S3FileSystem) -> None:
+    await s3._call_s3("put_object", Bucket=test_bucket_name, Key="a/b.txt", Body=b"abc")
+    before = await s3._ls(f"{test_bucket_name}/a/")
+    assert sorted(before) == ["test/a/b.txt"]
+    await s3._pipe_file(f"{test_bucket_name}/a/c.txt", data=b"abc")
+    after = await s3._ls(f"{test_bucket_name}/a/")
+    assert sorted(after) == ["test/a/b.txt", "test/a/c.txt"]