BUG: fix error when unstacking with sort=False when indexes contains NA
#25774
| Job | Run time |
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| 15m 30s | |
| 23m 22s | |
| 18m 34s | |
| 34m 19s | |
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| 34m 9s | |
| 28m 51s | |
| 26m 7s | |
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| 34m 13s | |
| 29m 27s | |
| 34m 20s | |
| 27m 1s | |
| 29m 13s | |
| 28m 5s | |
| 29m 33s | |
| 34m 10s | |
| 34m 20s | |
| 20m 34s | |
| 17m 13s | |
| 34m 17s | |
| 29m 35s | |
| 5m 11s | |
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| 23m 6s | |
| 34m 12s | |
| 34m 12s | |
| 20m 58s | |
| 24m 35s | |
| 28m 25s | |
| 14h 25m 34s |