searchView menuItem appears in the collapsible menu then disappears

My current situation is as so:

My SearchView appears on the menu.

Normally the collapsible menu does not have the menu for search.

When I press the search menu and open the collapsible menu there is Search in the collapsible menu. Why does this happen?

Also, after this happens, if the collapsible menu is closed and the user exits the search, the search icon disappears. How can I resolve the issue?

My onCreateOptionsMenu:

        val inflater: MenuInflater = menuInflater
        inflater.inflate(R.menu.menu, menu)

        val trendingBtn = menu?.findItem(R.id.trending)
        trendingBtn?.setOnMenuItemClickListener {
            viewModel.trending()
            true
        }


        val searchItem = menu?.findItem(R.id.search)
        val searchView = searchItem?.actionView as SearchView

        searchItem.setOnActionExpandListener(object : MenuItem.OnActionExpandListener {
            override fun onMenuItemActionExpand(item: MenuItem?): Boolean {
                Toast.makeText(this@MainActivity, "Search is Expanded", Toast.LENGTH_SHORT).show()
                return true
            }

            override fun onMenuItemActionCollapse(item: MenuItem?): Boolean {
                Toast.makeText(this@MainActivity, "Search is Collapsed", Toast.LENGTH_SHORT).show()
                return true
            }
        })

        searchView.queryHint = "Search"
        searchView.setOnQueryTextListener(object : OnQueryTextListener {
            override fun onQueryTextChange(s: String): Boolean {
                return false
            }

            override fun onQueryTextSubmit(s: String?): Boolean {
                val searchString = "Searching " + s
                Toast.makeText(this@MainActivity, searchString, Toast.LENGTH_SHORT).show()

                loadSearchVideoList(s)

                val intent = Intent(applicationContext, MainActivity::class.java)
                intent.putExtra(SearchManager.QUERY, s)
                intent.putExtra(
                    "CUSTOM_MESSAGE",
                    "you can also add custom message when submitting the search action"
                )
                intent.action = Intent.ACTION_SEARCH
                startActivity(intent)
                return false
            }
        })

        return super.onCreateOptionsMenu(menu)
    }

My menu.xml:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:title="@string/search"
        android:icon="@drawable/ic_search"
        android:id="@+id/search"
        app:showAsAction="ifRoom|collapseActionView"
        app:actionViewClass="androidx.appcompat.widget.SearchView"/>
    <item
        android:title="@string/trending"
        android:icon="@drawable/ic_baseline_trending_up_24"
        android:id="@+id/trending"/>


</menu>