fix onEnter test

Author: birkskyum

packages/router-core/src/router.ts

@@ -2131,18 +2131,19 @@ export class RouterCore<
                     })
                     this.clearExpiredCache()
                   })
-                })
 
-                //
-                ;(
-                  [
-                    [exitingMatches, 'onLeave'],
-                    [enteringMatches, 'onEnter'],
-                    [stayingMatches, 'onStay'],
-                  ] as const
-                ).forEach(([matches, hook]) => {
-                  matches.forEach((match) => {
-                    this.looseRoutesById[match.routeId]!.options[hook]?.(match)
+                  // Call lifecycle hooks inside the transition so they execute synchronously
+                  // even when startTransition is async (e.g., in Solid)
+                  ;(
+                    [
+                      [exitingMatches, 'onLeave'],
+                      [enteringMatches, 'onEnter'],
+                      [stayingMatches, 'onStay'],
+                    ] as const
+                  ).forEach(([matches, hook]) => {
+                    matches.forEach((match) => {
+                      this.looseRoutesById[match.routeId]!.options[hook]?.(match)
+                    })
                   })
                 })
               })