only mark dynamic import as replaced if it was completely overwritten

src/ast/nodes/Import.ts

@@ -47,7 +47,7 @@ export default class Import extends NodeBase {
 
 	private resolutionNamespace: string;
 	private resolutionInterop: boolean;
-	private rendered: boolean;
+	private replaced: boolean;
 
 	include() {
 		this.included = true;
@@ -56,14 +56,14 @@ export default class Import extends NodeBase {
 
 	initialise() {
 		this.included = false;
-		this.rendered = false;
+		this.replaced = false;
 		this.resolutionNamespace = undefined;
 		this.resolutionInterop = false;
 		this.context.addDynamicImport(this);
 	}
 
 	renderFinalResolution(code: MagicString, resolution: string) {
-		if (this.included && !this.rendered) {
+		if (this.included && !this.replaced) {
 			code.overwrite(this.parent.arguments[0].start, this.parent.arguments[0].end, resolution);
 		}
 	}
@@ -78,7 +78,7 @@ export default class Import extends NodeBase {
 				`Promise.resolve().then(function${_}()${_}{${_}return ${this.resolutionNamespace}${s}${_}})`
 			);
 
-			this.rendered = true;
+			this.replaced = true;
 			return;
 		}
 
@@ -91,8 +91,6 @@ export default class Import extends NodeBase {
 			const rightMechanism =
 				(this.resolutionInterop && importMechanism.interopRight) || importMechanism.right;
 			code.overwrite(this.parent.arguments[0].end, this.parent.end, rightMechanism);
-
-			this.rendered = true;
 		}
 	}