Update engine observer methods #788

Job	Run time
test (macos-13, 14.2, iOS Simulator,OS=17.2,name=iPhone 14 Pro)	21m 30s
test (macos-13, 14.2, iOS Simulator,OS=17.2,name=iPhone 14 Pro)	20m 55s
test (macos-13, 14.2, macOS)	5m 35s
test (macos-13, 14.2, macOS)	5m 35s
test (macos-13, 14.2, macOS,variant=Mac Catalyst)	4m 37s
test (macos-13, 14.2, macOS,variant=Mac Catalyst)	4m 37s
test (macos-14, 15.4, iOS Simulator,OS=17.5,name=iPhone 15 Pro)	19m 55s
test (macos-14, 15.4, iOS Simulator,OS=17.5,name=iPhone 15 Pro)	19m 55s
test (macos-14, 15.4, macOS)	5m 13s
test (macos-14, 15.4, macOS)	5m 13s
test (macos-14, 15.4, macOS,variant=Mac Catalyst)	4m 44s
test (macos-14, 15.4, macOS,variant=Mac Catalyst)	4m 44s
test (macos-14, 15.4, visionOS Simulator,name=Apple Vision Pro)	16m 13s
test (macos-14, 15.4, visionOS Simulator,name=Apple Vision Pro)	16m 13s
test (macos-14, 15.4, tvOS Simulator,name=Apple TV)	8m 4s
test (macos-14, 15.4, tvOS Simulator,name=Apple TV)	8m 4s
test (macos-15, 16.2, iOS Simulator,OS=18.1,name=iPhone 16 Pro)	9m 24s
test (macos-15, 16.2, iOS Simulator,OS=18.1,name=iPhone 16 Pro)	9m 24s
test (macos-15, 16.2, macOS)	5m 35s
test (macos-15, 16.2, macOS)	5m 35s
test (macos-15, 16.2, macOS,variant=Mac Catalyst)	4m 54s
test (macos-15, 16.2, macOS,variant=Mac Catalyst)	4m 54s
	3h 30m 53s

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