see if this fixes the prettier stuff

packages/svelte/src/compiler/phases/1-parse/state/tag.js

@@ -110,12 +110,14 @@ function open(parser) {
 			}
 
 			let assertion = null;
+			let end = expression.end;
 
 			expression = walk(expression, null, {
 				// @ts-expect-error
 				TSAsExpression(node, context) {
 					if (node.end === /** @type {import('estree').Expression} */ (expression).end) {
 						assertion = node;
+						end = node.expression.end;
 						return node.expression;
 					}
 
@@ -123,6 +125,8 @@ function open(parser) {
 				}
 			});
 
+			expression.end = end;
+
 			if (assertion) {
 				// we can't reset `parser.index` to `expression.expression.end` because
 				// it will ignore any parentheses — we need to jump through this hoop