Missmatch of Array.store_path.store.list_prefix() and Array._iter_chunk_keys() in chunks_initialized() for an array in a group #2861

import zarr

# Create a group with two arrays
root = zarr.group("reproduction.zarr")
root.create("x", shape=(1000, 1000), chunks=(100, 100), dtype="f4")
root.create("y", shape=(1000, 1000), chunks=(100, 100), dtype="uint8")
root.tree()

from zarr.core.array import chunks_initialized

# Now check which chunks are initialized (should be an empty tuple)
await chunks_initialized(root["x"])
> ()

# Now fill two chunks
root["x"][0:100, 0:100] = 1.0
root["x"][100:200, 0:100] = 2.0

# Now check which chunks are initialized (should be a tuple with two chunks)
await chunks_initialized(root["x"])
> ()  # <-- This shouldn't be empty

# Further investigate what happens in "chunks_initialized()"
store_contents = [x async for x in root["x"].store_path.store.list_prefix(prefix=root["x"].store_path.path)]
store_contents
> ['x/zarr.json', 'x/c/1/0', 'x/c/0/0']

tuple(chunk_key for chunk_key in root["x"]._iter_chunk_keys())

> ('c/0/0',
 'c/0/1',
 'c/0/2',
 'c/0/3',
 'c/0/4',
 'c/0/5',
 'c/0/6',
 'c/0/7',
 'c/0/8',
 'c/0/9',
 'c/1/0',
 'c/1/1',
 'c/1/2',
 'c/1/3',
 'c/1/4',
...
 'c/9/5',
 'c/9/6',
 'c/9/7',
 'c/9/8',
 'c/9/9')