BUG: Fix .rolling().mean() returning NaNs on reassignment (#61841) #24424

Job	Run time
Linux-Musl	15m 56s
Linux-32-bit	18m 33s
Pyodide build	23m 0s
python-dev	0s
macos-14 actions-310.yaml	22m 44s
windows-latest actions-310.yaml	35m 31s
windows-latest actions-311.yaml	35m 21s
macos-14 actions-311.yaml	27m 3s
macos-13 actions-310.yaml	23m 38s
windows-latest actions-312.yaml	36m 15s
macos-13 actions-311.yaml	31m 53s
macos-13 actions-313.yaml	25m 58s
macos-14 actions-313.yaml	24m 21s
ubuntu-24.04-arm actions-311.yaml	37m 2s
windows-latest actions-313.yaml	42m 52s
macos-14 actions-312.yaml	22m 42s
macos-13 actions-312.yaml	26m 51s
ubuntu-24.04-arm actions-312.yaml	37m 20s
Numpy Dev	16m 38s
ubuntu-24.04 actions-311.yaml	42m 41s
Future infer strings (without pyarrow)	39m 13s
Downstream Compat	5m 40s
Minimum Versions	24m 19s
ubuntu-24.04 actions-310.yaml	46m 28s
Freethreading	21m 15s
Locale: zh_CN	24m 0s
ubuntu-24.04-arm actions-313.yaml	36m 33s
ubuntu-24.04 actions-313.yaml	46m 41s
Pyarrow Nightly	20m 43s
Locale: it_IT	24m 9s
Future infer strings	44m 42s
ubuntu-24.04 actions-312.yaml	43m 57s
ubuntu-24.04-arm actions-310.yaml	39m 17s
	16h 3m 16s

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