Fix lsp-completion-default-behaviour custom group #5422

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 5s
test (ubuntu-latest, 28.2, false)	2m 29s
test (ubuntu-latest, 29.4, false)	2m 25s
test (macos-latest, 28.2, false)	3m 42s
test (macos-latest, 29.4, false)	3m 23s
test (windows-latest, 27.2, false)	2m 56s
test (windows-latest, 28.2, false)	3m 28s
test (windows-latest, 29.4, false)	4m 1s
test (ubuntu-latest, snapshot, true)	1m 21s
test (macos-latest, snapshot, true)	2m 55s
test (windows-latest, snapshot, true)	4m 57s
	33m 42s

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