BUG: Index allows one item to be `list` among others that are not #23926

Job	Run time
Linux-32-bit	18m 44s
python-dev	0s
Linux-Musl	15m 26s
macos-14 actions-311.yaml	25m 56s
macos-14 actions-312.yaml	27m 39s
windows-latest actions-311.yaml	36m 44s
macos-14 actions-313.yaml	44m 33s
windows-latest actions-310.yaml	36m 0s
Pyodide build	23m 35s
macos-13 actions-311.yaml	25m 56s
macos-14 actions-310.yaml	48m 16s
windows-latest actions-313.yaml	43m 25s
macos-13 actions-312.yaml	30m 39s
windows-latest actions-312.yaml	38m 10s
macos-13 actions-310.yaml	22m 29s
macos-13 actions-313.yaml	32m 1s
Downstream Compat	5m 27s
Locale: it_IT	23m 50s
ubuntu-24.04 actions-310.yaml	46m 26s
Freethreading	21m 10s
ubuntu-24.04 actions-311.yaml	43m 23s
ubuntu-24.04-arm actions-311.yaml	35m 45s
ubuntu-24.04-arm actions-313.yaml	36m 55s
Pypy	1m 32s
ubuntu-24.04-arm actions-310.yaml	36m 6s
ubuntu-24.04-arm actions-312.yaml	35m 54s
Future infer strings	45m 22s
Pyarrow Nightly	20m 29s
Minimum Versions	22m 46s
ubuntu-24.04 actions-313.yaml	47m 24s
Numpy Dev	16m 48s
Future infer strings (without pyarrow)	37m 45s
Locale: zh_CN	23m 51s
ubuntu-24.04 actions-312.yaml	43m 53s
	16h 54m 19s

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