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Fix findChild/findChildren logic: #748

Job	Run time
macOS (latest, 3.11, 5.12.*, debug)	15m 51s
ubuntu (24.04)	17m 50s
macOS (latest, 3.9, 5.9.*, debug)	10m 18s
oldschool (rockylinux, 9, release)	4m 47s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 53s
oldschool (rockylinux, 9, debug)	5m 20s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 51s
ubuntu (22.04)	17m 36s
windows (win64_mingw73, 3.10, 5.12.*, x64)	5m 35s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 3s
macOS (latest, 3.9, 5.9.*, release)	6m 20s
	1h 39m 24s

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