Can't select base of Prefab Variant or any greyed out field in a inspector. 2019.4.13f1.

I recently updated my project from 2019.4.2f1 to 2019.4.13f1.
Since the update I no longer can select greyed out fields like “Script” field or “Base” of prefab variant.
171263-zrzut-ekranu-2020-11-19-151756.png
or
171264-zrzut-ekranu-2020-11-19-151941.png

Usually after clicking on such field in a “Project” window, an asset would be shown, but since update clicking on fields does nothing.

Unability to select bases of variants is the most painful.

Workaround for selecting a base.
Create new script in an “Editor” folder and paste this code to it. After right clicking on any prefab variant, button in “Tools” should appear .

using UnityEditor;

public class PrefabsMenuItem
{
	[MenuItem("Assets/Tools/Show Base of Prefab Variant", priority = 18)]
	public static void PingBaseOfPrefabVariant()
	{
		GameObject[] gameObjects = Selection.GetFiltered<GameObject>(SelectionMode.Assets);

		GameObject baseOfPrefab = PrefabUtility.GetCorrespondingObjectFromSource(gameObjects[0]);
		EditorGUIUtility.PingObject(baseOfPrefab);
	}

	[MenuItem("Assets/Tools/Show Base of Prefab Variant", priority = 18, validate = true)]
	public static bool PingBaseOfPrefabVariantValidate()
	{
		GameObject[] gameObjects = Selection.GetFiltered<GameObject>(SelectionMode.Assets);

		return gameObjects.Length > 0 && PrefabUtility.GetPrefabAssetType(gameObjects[0]) == PrefabAssetType.Variant;
	}
}