Fix invalid initialize request handling #3299

Job	Run time
build (ubuntu-latest, Release)	12m 8s
build (ubuntu-latest, Debug)	12m 1s
build (windows-latest, Release)	17m 46s
build (macos-latest, Release)	13m 7s
build (windows-latest, Debug)	18m 55s
build (macos-latest, Debug)	20m 45s
publish-coverage / publish-coverage	37s
	1h 35m 19s

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