Tests

fix: retain system metadata when calling `flatten` #943

Job	Run time
Tests (1, Downstream) / Tests - Downstream	19m 18s
Tests (1, Extended) / Tests - Extended	16m 37s
Tests (1, Extensions) / Tests - Extensions	24m 14s
Tests (1, Initialization) / Tests - Initialization	21m 10s
Tests (1, InterfaceI) / Tests - InterfaceI	35m 15s
Tests (1, InterfaceII) / Tests - InterfaceII	27m 16s
Tests (1, RegressionI) / Tests - RegressionI	13m 34s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	17m 48s
Tests (lts, Downstream) / Tests - Downstream	10m 26s
Tests (lts, Extensions) / Tests - Extensions	20m 46s
Tests (lts, Initialization) / Tests - Initialization	14m 39s
Tests (lts, InterfaceI) / Tests - InterfaceI	25m 18s
Tests (lts, Extended) / Tests - Extended	9m 36s
Tests (lts, InterfaceII) / Tests - InterfaceII	17m 28s
Tests (lts, RegressionI) / Tests - RegressionI	9m 14s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	10m 3s
Tests (pre, Downstream) / Tests - Downstream	18m 34s
Tests (pre, Extended) / Tests - Extended	16m 7s
Tests (pre, Extensions) / Tests - Extensions	32m 22s
Tests (pre, InterfaceI) / Tests - InterfaceI	34m 41s
Tests (pre, Initialization) / Tests - Initialization	21m 45s
Tests (pre, InterfaceII) / Tests - InterfaceII	26m 26s
Tests (pre, RegressionI) / Tests - RegressionI	13m 26s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	17m 22s
	7h 53m 25s

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