Aug 31, 2025 · Aug 31, 2025 · Aug 31, 2025 · Aug 31, 2025 · Aug 31, 2025 · Sep 1, 2025
diff --git a/packages/query-core/src/utils.ts b/packages/query-core/src/utils.ts
Original file line number	Diff line number	Diff line change
Expand Up		@@ -257,38 +257,39 @@ export function replaceEqualDeep(a: any, b: any): any {
		}

		const array = isPlainArray(a) && isPlainArray(b)

	if (array \|\| (isPlainObject(a) && isPlainObject(b))) {
	const aItems = array ? a : Object.keys(a)
	const aSize = aItems.length
	const bItems = array ? b : Object.keys(b)
	const bSize = bItems.length
	const copy: any = array ? [] : {}
	const aItemsSet = new Set(aItems)

	let equalItems = 0

	for (let i = 0; i < bSize; i++) {
	const key = array ? i : bItems[i]
	if (
	((!array && aItemsSet.has(key)) \|\| array) &&
	a[key] === undefined &&
	b[key] === undefined
	) {
	copy[key] = undefined
	const object = !array && isPlainObject(a) && isPlainObject(b)

	if (!array && !object) return b

	const aItems = array ? a : Object.keys(a)
	const aSize = aItems.length
	const bItems = array ? b : Object.keys(b)
	const bSize = bItems.length
	const copy: any = array ? new Array(bSize) : {}
	// const aItemsSet = new Set(aItems)

	let equalItems = 0

	for (let i = 0; i < bSize; i++) {
	const key = array ? i : bItems[i]
	const aItem = a[key]
	if (
	(array \|\| a.hasOwnProperty(key)) &&
	aItem === undefined &&
	b[key] === undefined
	) {
	copy[key] = undefined
	equalItems++
	} else {
	const value = replaceEqualDeep(aItem, b[key])
	copy[key] = value
	if (value === aItem && aItem !== undefined) {
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		equalItems++
	} else {
	copy[key] = replaceEqualDeep(a[key], b[key])
	if (copy[key] === a[key] && a[key] !== undefined) {
	equalItems++
	}
		}
		}

	return aSize === bSize && equalItems === aSize ? a : copy
		}

	return b
	return aSize === bSize && equalItems === aSize ? a : copy
		}

		/**
Expand Down