BUG: Add fillna at the beginning of _where not to fill NA. #60729 #23888

Job	Run time
Linux-Musl	15m 29s
Pyodide build	23m 16s
python-dev	0s
Linux-32-bit	18m 23s
macos-14 actions-313.yaml	16m 25s
windows-latest actions-310.yaml	35m 52s
windows-latest actions-311.yaml	36m 53s
macos-13 actions-310.yaml	35m 13s
windows-latest actions-312.yaml	34m 3s
macos-13 actions-311.yaml	26m 28s
macos-13 actions-312.yaml	26m 48s
macos-13 actions-313.yaml	29m 42s
macos-14 actions-310.yaml	16m 35s
macos-14 actions-311.yaml	27m 48s
windows-latest actions-313.yaml	39m 48s
ubuntu-24.04 actions-310.yaml	46m 4s
macos-14 actions-312.yaml	23m 16s
ubuntu-24.04-arm actions-312.yaml	34m 55s
ubuntu-24.04 actions-312.yaml	43m 27s
ubuntu-24.04-arm actions-310.yaml	36m 15s
Freethreading	22m 6s
ubuntu-24.04-arm actions-313.yaml	36m 7s
Pyarrow Nightly	20m 18s
Locale: it_IT	23m 26s
ubuntu-24.04 actions-313.yaml	46m 55s
Pypy	1m 18s
ubuntu-24.04 actions-311.yaml	42m 8s
Future infer strings	44m 38s
Minimum Versions	23m 6s
ubuntu-24.04-arm actions-311.yaml	35m 3s
Numpy Dev	16m 43s
Future infer strings (without pyarrow)	38m 37s
Locale: zh_CN	23m 38s
Downstream Compat	5m 22s
	15h 46m 5s

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