Use ._is_mutable() to account for parent state proxy
#5503
| Job | Run time |
|---|---|
| 9m 30s | |
| 2m 56s | |
| 2m 42s | |
| 2m 48s | |
| 8m 46s | |
| 2m 32s | |
| 8m 46s | |
| 2m 45s | |
| 12m 44s | |
| 8m 28s | |
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| 7m 31s | |
| 11m 50s | |
| 3m 39s | |
| 4m 34s | |
| 4m 28s | |
| 4m 26s | |
| 4m 55s | |
| 4m 59s | |
| 6m 53s | |
| 5m 56s | |
| 2h 13m 36s |