fix

packages/svelte/src/internal/client/dom/elements/transitions.js

@@ -185,7 +185,9 @@ export function transition(flags, element, get_fn, get_params) {
 			const start_p = p;
 			const end_time = start_time + adjusted_duration;
 
-			// tick?.(p, 1 - p); // TODO put in nested effect, to avoid interleaved reads/writes?
+			if (p === 0) {
+				tick?.(p, 1 - p); // TODO put in nested effect, to avoid interleaved reads/writes?
+			}
 
 			current_task = loop((now) => {
 				if (now >= end_time) {