Fixing bad args handling in netcore test #605

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 4s
test (ubuntu-latest, 28.2, false)	1m 10s
test (ubuntu-latest, 29.4, false)	2m 17s
test (macos-latest, 28.2, false)	2m 13s
test (macos-latest, 29.4, false)	2m 36s
test (windows-latest, 27.2, false)	2m 9s
test (windows-latest, 28.2, false)	2m 6s
test (windows-latest, 29.4, false)	2m 11s
test (ubuntu-latest, snapshot, true)	52s
test (macos-latest, snapshot, true)	2m 26s
test (windows-latest, snapshot, true)	3m 34s
	22m 38s

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