BUG: Add fillna at the beginning of _where not to fill NA. #60729 #23833

Job	Run time
Linux-32-bit	18m 26s
Linux-Musl	15m 41s
Pyodide build	23m 30s
macos-13 actions-310.yaml	1h 8m 31s
macos-13 actions-312.yaml	1h 6m 38s
macos-13 actions-313.yaml	1h 4m 41s
macos-13 actions-311.yaml	1h 5m 6s
macos-14 actions-311.yaml	24m 31s
macos-14 actions-310.yaml	38m 44s
windows-latest actions-312.yaml	1h 22m 45s
windows-latest actions-311.yaml	1h 23m 24s
windows-latest actions-313.yaml	1h 30m 44s
macos-14 actions-313.yaml	25m 33s
windows-latest actions-310.yaml	1h 22m 33s
ubuntu-24.04 actions-311.yaml	1h 30m 21s
macos-14 actions-312.yaml	33m 14s
ubuntu-24.04 actions-310.yaml	1h 30m 23s
Freethreading	21m 13s
ubuntu-24.04 actions-313.yaml	1h 30m 23s
ubuntu-24.04-arm actions-310.yaml	1h 5m 30s
python-dev	0s
ubuntu-24.04-arm actions-313.yaml	1h 8m 32s
Locale: it_IT	1h 13m 23s
Pypy	2m 18s
Locale: zh_CN	1h 11m 31s
Downstream Compat	7m 2s
Future infer strings (without pyarrow)	1h 28m 56s
Numpy Dev	17m 22s
ubuntu-24.04-arm actions-312.yaml	1h 4m 39s
Future infer strings	1h 30m 23s
Minimum Versions	53m 40s
ubuntu-24.04-arm actions-311.yaml	1h 5m 34s
ubuntu-24.04 actions-312.yaml	1h 30m 23s
Pyarrow Nightly	20m 35s
	1d 6h 56m 9s

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