gh-145376: Fix refleaks and double decref for code in Python/ #2329

Job	Run time
x86_64-apple-darwin/clang	21m 3s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 38s
aarch64-unknown-linux-gnu/gcc	7m 9s
x86_64-pc-windows-msvc/msvc	9m 51s
aarch64-apple-darwin/clang	9m 35s
x86_64-unknown-linux-gnu/gcc	9m 45s
x86_64-pc-windows-msvc/msvc-free-threading	4m 38s
	1h 10m 39s

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