fix: Properly process pre-existing Actor input file #680

Job	Run time
Type check / Type check (3.12)	24s
Type check / Type check (3.11)	26s
Lint check / Lint check (3.12)	13s
Type check / Type check (3.10)	29s
Lint check / Lint check (3.13)	10s
Type check / Type check (3.13)	28s
Unit tests / Unit tests (ubuntu-latest, 3.10)	27s
Lint check / Lint check (3.11)	11s
Unit tests / Unit tests (ubuntu-latest, 3.12)	27s
Unit tests / Unit tests (windows-latest, 3.11)	1m 12s
Unit tests / Unit tests (ubuntu-latest, 3.11)	22s
Unit tests / Unit tests (windows-latest, 3.10)	44s
Docs check / Docs check	1m 10s
Lint check / Lint check (3.10)	12s
Unit tests / Unit tests (ubuntu-latest, 3.13)	25s
Unit tests / Unit tests (windows-latest, 3.12)	1m 4s
Unit tests / Unit tests (windows-latest, 3.13)	52s
Integration tests / Integration tests (3.10)	9m 43s
Integration tests / Integration tests (3.13)	10m 41s
Integration tests / Approve integration tests for PRs from forks	-1s
Integration tests / Integration tests for PRs from forks	-1s
	29m 38s

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