fix(pt): fix `get_dim` for `DescrptDPA1Compat` #8602

Job	Run time
determine-arm64-runner	1s
Build source distribution	10s
Build wheels for cp311-manylinux_x86_64	6m 6s
Build wheels for cp311-manylinux_x86_64	6m 2s
Build wheels for cp311-macosx_x86_64	7m 47s
Build wheels for cp311-macosx_arm64	2m 37s
Build wheels for cp311-win_amd64	4m 47s
Build wheels for cp310-manylinux_aarch64	5m 3s
build_docker (12)	3m 18s
build_pypi_index	16s
build_docker (_cu11, 11)	3m 31s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	2s
	39m 40s

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