Fix URI template derivation and lookup #489

Job	Run time
build (ubuntu-latest, Debug)	3m 5s
build (windows-latest, Debug)	5m 26s
build (windows-latest, Release)	6m 2s
build (ubuntu-latest, Release)	2m 36s
build (macos-latest, Release)	1m 55s
build (macos-latest, Debug)	4m 3s
publish-coverage	0s
	23m 7s

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