CompositeControl: ambiguous GetContents error message, test inheritance #2708

Job	Run time
Build all projects without errors	11m 23s
.NET unit tests (ubuntu-latest)	4m 34s
Build published projects without warnings (Release)	3m 8s
JS unit tests	2m 4s
.NET unit tests (windows-2022)	13m 56s
Build published projects without warnings (Debug)	2m 37s
.NET unit tests (macOS-latest)	6m 45s
UI tests (chrome, ubuntu-latest, Production, Default)	17m 48s
UI tests (chrome, windows-2022, Development, Default)	12m 59s
UI tests (firefox, ubuntu-latest, Development, Default)	24m 20s
UI tests (firefox, ubuntu-latest, Production, Default)	21m 10s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	25m 33s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	16m 52s
	2h 43m 9s

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