Fix panic when filling up types vector during unpacking #34738

Job	Run time
python package	1m 12s
Determine changes	11s
mkdocs	2m 42s
cargo fmt	19s
pre-commit	34s
cargo clippy	1m 52s
cargo build (release)	4m 45s
cargo test (linux)	3m 59s
cargo build (msrv)	3m 38s
cargo test (wasm)	1m 41s
cargo test (windows)	8m 26s
benchmarks	4m 36s
cargo fuzz	4m 34s
cargo shear	25s
formatter instabilities and black similarity	0s
test scripts	1m 0s
ecosystem	8m 44s
test ruff-lsp	17s
Fuzz the parser	0s
	48m 55s

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