BUG: Fix bug in reindexing of period columns after unstack #22436

Job	Run time
Linux-32-bit	18m 22s
Pyodide build	23m 5s
Linux-Musl	16m 36s
python-dev (macOS-13)	17m 3s
python-freethreading	24m 25s
python-dev (macOS-14)	11m 34s
python-dev (ubuntu-22.04)	20m 10s
python-dev (windows-latest)	22m 37s
macos-13 actions-310.yaml	28m 52s
macos-13 actions-311.yaml	21m 57s
macos-13 actions-312.yaml	29m 47s
macos-14 actions-310.yaml	18m 21s
macos-14 actions-311.yaml	16m 24s
macos-14 actions-312.yaml	19m 33s
windows-latest actions-311.yaml	37m 26s
windows-latest actions-312.yaml	47m 19s
windows-latest actions-310.yaml	33m 38s
Future infer strings (without pyarrow)	41m 26s
Locale: zh_CN	24m 25s
Locale: it_IT	23m 37s
Downstream Compat	5m 52s
Numpy Dev	16m 39s
Minimum Versions	23m 18s
Pyarrow Nightly	20m 27s
Future infer strings	50m 26s
Pypy	1m 17s
ubuntu-22.04 actions-310.yaml	48m 17s
ubuntu-22.04 actions-311.yaml	44m 29s
ubuntu-22.04 actions-312.yaml	48m 42s
ubuntu-24.04-arm actions-311.yaml	26m 23s
ubuntu-24.04-arm actions-312.yaml	29m 56s
ubuntu-24.04-arm actions-310.yaml	43m 39s
	14h 16m 2s

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