contextualise is only called once per expression

src/generators/Generator.js

@@ -63,8 +63,6 @@ export default class Generator {
 	}
 
 	contextualise ( block, expression, context, isEventHandler ) {
-		if ( expression._contextualised ) return expression._contextualised;
-
 		this.addSourcemapLocations( expression );
 
 		const usedContexts = [];
@@ -155,13 +153,11 @@ export default class Generator {
 			}
 		});
 
-		expression._contextualised = {
+		return {
 			dependencies,
 			contexts: usedContexts,
 			snippet: `[✂${expression.start}-${expression.end}✂]`
 		};
-
-		return expression._contextualised;
 	}
 
 	findDependencies ( block, expression, isEventHandler ) {

src/generators/dom/visitors/EachBlock.js

@@ -187,7 +187,7 @@ function unkeyed ( generator, block, state, node, snippet, { create_each_block,
 		}
 	` );
 
-	const { dependencies } = block.contextualise( node.expression );
+	const dependencies = block.findDependencies( node.expression );
 	const allDependencies = new Set( block.dependencies );
 	dependencies.forEach( dependency => {
 		allDependencies.add( dependency );