Fix Spacer orientation when inside a block with default flex layout. (#…

…58921)

Co-authored-by: tellthemachines <isabel_brison@git.wordpress.org>
Co-authored-by: andrewserong <andrewserong@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: draganescu <andraganescu@git.wordpress.org>

packages/block-library/src/spacer/edit.js

@@ -93,9 +93,14 @@ const SpacerEdit = ( {
 		return editorSettings?.disableCustomSpacingSizes;
 	} );
 	const { orientation } = context;
-	const { orientation: parentOrientation, type } = parentLayout || {};
+	const {
+		orientation: parentOrientation,
+		type,
+		default: { type: defaultType } = {},
+	} = parentLayout || {};
 	// Check if the spacer is inside a flex container.
-	const isFlexLayout = type === 'flex';
+	const isFlexLayout =
+		type === 'flex' || ( ! type && defaultType === 'flex' );
 	// If the spacer is inside a flex container, it should either inherit the orientation
 	// of the parent or use the flex default orientation.
 	const inheritedOrientation =