Importing `TYPE_CHECKING` twice result in type error

[grievejia]

Describe the Bug

Minimal repro:

from typing import TYPE_CHECKING
...
from typing import TYPE_CHECKING  # FP: Cannot assign (imported as final) 

Sandbox Link

https://pyrefly.org/sandbox/?project=N4IgZglgNgpgziAXKOBDAdgEwEYHsAeAdAA4CeS4ATrgLYAEALqcROgOZ0Q3G6UN0AVAJoAFAKIB9AMIAJMVIDSASQByAcQA66Qjq1hq9Ji3aduvfsPHS5i1Wrp0AxHQBiIxHSkZ0ufqjhwEGzodAAUXDx8MJh0-nSQ6KhQAJR0IAA0IACuDNBwJOSIIM4AqrlQEEzxWegAxrm46HBaWpgwYPG8NKgMEuhZNNgwlKH4HqwMqQC0AHx0cAyUiFoODpQwDFmUIWAaICoDQ0t0wPgAvntaGSBk62BQpIQMtFAUziKkdw-zGDgEdLVGpA2FsehBGoQtM4AMowGB0AAWDAYxDgiAA9Ojbu0HoReGx0TB0OjMLhanB0YD0MDQQ1iZ1KLEAG6oaCobCwAFAoK08EhXDEOn5LRkBgIxpTJnDQKNOgAXjoewAzIQAIwAJku6BAZ0yqHqEClLmgMAoaCweCIZB1QA

(Only applicable for extension issues) IDE Information

No response