Merge pull request #2710 from github/henrymercer/fix-extension-assump… #4641

Job	Run time
Packaging: Download using registries (ubuntu-latest, nightly-latest)	51s
Packaging: Download using registries (ubuntu-latest, linked)	40s
Packaging: Download using registries (macos-latest, linked)	1m 30s
Packaging: Download using registries (macos-latest, default)	1m 41s
Packaging: Download using registries (windows-latest, nightly-latest)	3m 36s
Packaging: Download using registries (windows-latest, default)	4m 33s
Packaging: Download using registries (ubuntu-latest, default)	40s
Packaging: Download using registries (macos-latest, nightly-latest)	1m 49s
Packaging: Download using registries (windows-latest, linked)	4m 7s
	19m 27s

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