Reuse original env when instantiating type #2898

Job	Run time
build-linux (ubuntu-latest)	47s
build (macos-13)	5m 47s
build-linux (buildjet-2vcpu-ubuntu-2204-arm)	1m 5s
build (macos-14)	2m 45s
build (windows-latest)	5m 10s
package	34s
	16m 8s

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