pt: fix redundant size assert #7407

Job	Run time
Build source distribution	18s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	5m 30s
Build wheels for cp311-manylinux_x86_64	5m 49s
Build wheels for cp311-macosx_x86_64	5m 28s
Build wheels for cp311-macosx_arm64	3m 1s
Build wheels for cp311-win_amd64	5m 49s
Build wheels for cp310-manylinux_aarch64	6m 3s
build_docker (12)	2m 24s
build_pypi_index	9s
upload_pypi	0s
build_docker (_cu11, 11)	2m 28s
deploy_pypi_index	0s
Pass testing build wheels	2s
	37m 2s

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