fix: discard preload fork before creating a new one (#14865)

* fix: discard preload fork before creating a new one

* tidy up

Author: Rich-Harris

.changeset/shy-clocks-smoke.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: discard preload fork before creating a new one

packages/kit/src/runtime/client/client.js

@@ -514,6 +514,8 @@ async function _preload_data(intent) {
 	// then a later one is becoming the real navigation and the preload tokens
 	// get out of sync.
 	if (intent.id !== load_cache?.id) {
+		discard_load_cache();
+
 		const preload = {};
 		preload_tokens.add(preload);
 		load_cache = {