Fix #4270: preserve Qt property accessor references for unusedFunction #20816

Job	Run time
build_cmake (ubuntu:25.10, true, true)	6m 3s
build_make (ubuntu:25.10)	5m 43s
build_make (alpine:3.23)	6m 42s
build_cmake (alpine:3.23, false, false)	4m 44s
build_make (ubuntu:24.04)	4m 58s
build_cmake (ubuntu:24.04, true, true)	6m 20s
	34m 30s

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