Test

fix/nested shard reads #6053

Job	Run time
doctests	1m 12s
py=3.13-upstream	11m 27s
py=3.11-min_deps	6m 49s
os=ubuntu-latest, py=3.11, deps=optional	6m 10s
os=ubuntu-latest, py=3.12, deps=minimal	5m 59s
os=ubuntu-latest, py=3.13, deps=minimal	6m 27s
os=ubuntu-latest, py=3.11, deps=minimal	5m 58s
os=windows-latest, py=3.13, deps=optional	8m 30s
os=ubuntu-latest, py=3.12, deps=optional	6m 28s
os=macos-latest, py=3.11, deps=optional	7m 21s
os=windows-latest, py=3.11, deps=optional	9m 34s
os=ubuntu-latest, py=3.13, deps=optional	6m 25s
os=macos-latest, py=3.13, deps=optional	6m 56s
Test complete	2s
	1h 29m 18s

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