BUG: Add fillna at the beginning of _where not to fill NA. #60729 #22259

Job	Run time
Linux-32-bit	4m 38s
Pyodide build	4m 44s
Linux-Musl	4m 44s
macos-13 actions-311.yaml	4m 14s
macos-13 actions-310.yaml	4m 11s
macos-13 actions-312.yaml	4m 18s
macos-14 actions-310.yaml	4m 26s
macos-14 actions-312.yaml	4m 30s
macos-14 actions-311.yaml	4m 26s
windows-latest actions-311.yaml	4m 19s
windows-latest actions-312.yaml	4m 19s
windows-latest actions-310.yaml	4m 21s
python-freethreading	4m 37s
python-dev (macOS-13)	4m 42s
python-dev (macOS-14)	4m 43s
python-dev (ubuntu-22.04)	4m 41s
python-dev (windows-latest)	4m 42s
Minimum Versions	4m 29s
Future infer strings (without pyarrow)	4m 28s
Locale: zh_CN	4m 31s
Locale: it_IT	4m 29s
Numpy Dev	4m 36s
Downstream Compat	4m 43s
Pyarrow Nightly	4m 40s
Future infer strings	4m 31s
Pypy	1m 16s
ubuntu-22.04 actions-310.yaml	4m 27s
ubuntu-22.04 actions-311.yaml	4m 28s
ubuntu-22.04 actions-312.yaml	4m 30s
ubuntu-24.04-arm actions-311.yaml	4m 27s
ubuntu-24.04-arm actions-312.yaml	4m 28s
ubuntu-24.04-arm actions-310.yaml	4m 33s
	2h 21m 11s

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