Fix `on_request callback` not triggering for API specs #3003

Job	Run time
check-package / pkg-build (ubuntu-latest)	19s
check-schema / schema	11s
check-package / merge-artifacts	17s
check-package / pkg-check (macos-latest, 3.10)	57s
check-package / pkg-check (ubuntu-latest, 3.10)	39s
check-package / pkg-check (windows-latest, 3.10)	1m 7s
check-package / pkg-guardian	3s
	3m 33s

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