Native Collection has not been disposed errors are thrown on searching in "Search asset store" window.

Steps to repro:
1. Create a new project.
2. Windows > Search > Asset Store.
3. Search any(material) keyword in the input field > Enter.
4. Wait for a few seconds.

Actual Result:
Native Collection has not been disposed errors in the console.

Expected Result:
No errors in the console.

Reproducible in:
2021.1.0a5, 2021.1.0a3.

Working Fine in:
2021.1.0a2.

Environment:
Occurring on Windows 10 & mac 10.15.

Stack trace:
A Native Collection has not been disposed, resulting in a memory leak. Allocated from:
Unity.Collections.NativeArray`1:.ctor(Byte[], Allocator)
UnityEngine.Networking.UploadHandlerRaw:.ctor(Byte[])
UnityEditor.Search.Providers.AssetStoreProvider:Post(String, String)
UnityEditor.Search.Providers.<SearchStore>d__34:MoveNext()
UnityEditor.Search.StackedEnumerator`1:MoveNext()
UnityEditor.Search.StackedEnumerator`1:NextItem(SearchItem&)
UnityEditor.Search.AsyncSearchSession:FetchSome(List`1, Int64)
UnityEditor.Search.SearchService:GetItems(SearchContext, SearchFlags)
UnityEditor.Search.QuickSearch:Refresh()
UnityEditor.Search.QuickSearch:DebouncedRefresh()
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()